Update GitHub Actions to latest stable versions

.github/actions/setup-unity-mcp/action.yml

@@ -47,7 +47,7 @@ runs:
 
     - name: Cache Unity Library
       if: inputs.cache-library == 'true'
-      uses: actions/cache@v4
+      uses: actions/cache@v5
       with:
         path: ${{ inputs.unity-project-path }}/Library
         key: unity-library-${{ steps.unity-version.outputs.unity_version }}-ubuntu-base

.github/actions/unity/activate-license/action.yml

@@ -31,7 +31,7 @@ runs:
   using: "composite"
   steps:
     - name: Setup Node.js
-      uses: actions/setup-node@v4
+      uses: actions/setup-node@v6
       with:
         node-version: "20"
 
@@ -95,7 +95,7 @@ runs:
 
     - name: Upload error screenshot
       if: failure()
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v6
       with:
         name: unity-license-error-${{ inputs.unityVersion }}
         path: error.png

.github/workflows/bump_version.yml

@@ -28,7 +28,7 @@ jobs:
           fi
 
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
 

.github/workflows/claude.yml

@@ -38,14 +38,14 @@ jobs:
       actions: read # Required for Claude to read CI results on PRs
     steps:
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: |
             8.0.x
             9.0.x
 
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 1
 

.github/workflows/copilot-setup-steps.yml

@@ -35,7 +35,7 @@ jobs:
     # If you do not check out your code, Copilot will do this for you.
     steps:
       - name: Checkout code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Unity MCP
         uses: ./.github/actions/setup-unity-mcp

.github/workflows/deploy.yml

@@ -34,7 +34,7 @@ jobs:
       contents: read
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Extract version from tag
         id: version
@@ -44,7 +44,7 @@ jobs:
           echo "Extracted version: $version"
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: "9.0.x"
 
@@ -84,7 +84,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Extract version from tag
         id: version
@@ -121,10 +121,10 @@ jobs:
       id-token: write
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Node.js
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: "22"
           registry-url: "https://registry.npmjs.org"

.github/workflows/deploy_server_executables.yml

@@ -21,10 +21,10 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: "9.0.x"
 

.github/workflows/release.yml

@@ -25,7 +25,7 @@ jobs:
       tag_exists: ${{ steps.tag_exists.outputs.exists }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           fetch-tags: true
@@ -52,7 +52,7 @@ jobs:
     if: needs.check-version-tag.outputs.tag_exists == 'false'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Activate Unity license
         id: activate
@@ -74,7 +74,7 @@ jobs:
         shell: bash
 
       - name: Cache Unity Library
-        uses: actions/cache@v4
+        uses: actions/cache@v5
         with:
           path: ./Installer/Library
           key: Library-Unity-Installer
@@ -120,7 +120,7 @@ jobs:
           customParameters: -CI true -GITHUB_ACTIONS true
 
       - name: Upload Unity Package as artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: unity-installer-package
           path: ./Installer/build/AI-Game-Dev-Installer.unitypackage
@@ -131,10 +131,10 @@ jobs:
     if: needs.check-version-tag.outputs.tag_exists == 'false'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: "9.0.x"
 
@@ -146,7 +146,7 @@ jobs:
         run: cd Unity-MCP-Server && ./build-all.sh Release
 
       - name: Upload build zips as artifact
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v6
         with:
           name: mcp-server-zips
           path: ./Unity-MCP-Server/publish/*.zip
@@ -267,7 +267,7 @@ jobs:
       release_notes: ${{ steps.rel_desc.outputs.release_body }}
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
           fetch-tags: true
@@ -330,7 +330,7 @@ jobs:
     if: needs.release-unity-plugin.outputs.success == 'true'
     steps:
       - name: Download Unity Package artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: unity-installer-package
           path: ./
@@ -349,10 +349,10 @@ jobs:
     if: needs.release-unity-plugin.outputs.success == 'true'
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Download build zips artifact
-        uses: actions/download-artifact@v4
+        uses: actions/download-artifact@v6
         with:
           name: mcp-server-zips
           path: ./Unity-MCP-Server/publish

.github/workflows/test_cli.yml

@@ -19,10 +19,10 @@ jobs:
         node-version: [20, 22]
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v4
+        uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
 

.github/workflows/test_pull_request.yml

@@ -23,10 +23,10 @@ jobs:
     runs-on: macos-latest
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Setup .NET
-        uses: actions/setup-dotnet@v4
+        uses: actions/setup-dotnet@v5
         with:
           dotnet-version: "9.0.x"
 

.github/workflows/test_unity_plugin.yml

@@ -39,7 +39,7 @@ jobs:
       # --------------------------------------------------------------------- #
       # 2-a. Checkout repository
       # --------------------------------------------------------------------- #
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           lfs: false
 
@@ -65,7 +65,7 @@ jobs:
           echo "project_path_sanitized=$sanitized_path" >> $GITHUB_OUTPUT
         shell: bash
 
-      - uses: actions/cache@v4
+      - uses: actions/cache@v5
         with:
           path: |
             ${{ inputs.projectPath }}/Library
@@ -105,7 +105,7 @@ jobs:
           customParameters: -CI true -GITHUB_ACTIONS true
 
       # --------------------------------------------------------------------- #
-      - uses: actions/upload-artifact@v4
+      - uses: actions/upload-artifact@v6
         if: always()
         with:
           name: Test results for ${{ inputs.unityVersion }} ${{ inputs.testMode }} on ${{ matrix.platform }}