Bump GitHub Actions across workflows

Update workflow dependencies to newer major versions in repository automation files. This upgrades `actions/checkout` to v7, `actions/github-script` to v9, `actions/create-github-app-token` to v3, and GitHub Pages actions (`upload-pages-artifact` and `deploy-pages`) to v5 to keep CI/CD and maintenance workflows current.

.github/workflows/auto-update-app-headers.yml

@@ -20,21 +20,21 @@ jobs:
     steps:
       - name: Generate a token
         id: generate-token
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@v3
         with:
           app-id: ${{ vars.APP_ID }}
           private-key: ${{ secrets.APP_PRIVATE_KEY }}
 
       - name: Generate a token for PR approval and merge
         id: generate-token-merge
-        uses: actions/create-github-app-token@v1
+        uses: actions/create-github-app-token@v3
         with:
           app-id: ${{ secrets.APP_ID_APPROVE_AND_MERGE }}
           private-key: ${{ secrets.APP_KEY_APPROVE_AND_MERGE }}
 
       # Step 1: Checkout repository
       - name: Checkout repository
-        uses: actions/checkout@v2
+        uses: actions/checkout@v7
 
       # Step 2: Disable file mode changes detection
       - name: Disable file mode changes