chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/lint.yaml

@@ -21,7 +21,7 @@ jobs:
       # SECURITY: With pull_request_target, checkout defaults to the base branch (main)
       # We must explicitly checkout the PR head to lint the actual changes
       - name: Check out Git repository
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
         with:
           # Checkout the actual PR code, not the base branch
           ref: ${{ github.event.pull_request.head.sha }}

.github/workflows/trunk-upgrade.yaml

@@ -17,7 +17,7 @@ jobs:
       pull-requests: write
     steps:
       - name: Checkout
-        uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5.0.1
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6.0.1
 
       - name: Run Trunk Upgrade
         uses: ./ # Use the local action for self-testing