Update build-pdf.yml

Upgrade action to v4.

Signed-off-by: Bill Traynor <[email protected]>

.github/workflows/build-pdf.yml

@@ -35,7 +35,7 @@ jobs:
     steps:
     # Step 1: Checkout the repository
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
       with:
         submodules: 'recursive'
 
@@ -52,7 +52,7 @@ jobs:
 
     # Step 4: Upload the built PDF files as a single artifact
     - name: Upload Build Artifacts
-      uses: actions/upload-artifact@v3
+      uses: actions/upload-artifact@v4
       with:
         name: Build Artifacts
         path: ${{ github.workspace }}/*.pdf
@@ -70,4 +70,4 @@ jobs:
       env:
         GITHUB_TOKEN: ${{ secrets.GHTOKEN }}
       if: github.event_name == 'workflow_dispatch' 
-      # This condition ensures this step only runs for workflow_dispatch events.
+      # This condition ensures this step only runs for workflow_dispatch events.