chore(deps): update actions/checkout action to v6 (#187)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/drupal-example.yaml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
-      uses: actions/checkout@v5
+      uses: actions/checkout@v6
       with:
         fetch-depth: "0"
     - name: Report versions

.github/workflows/merge-branch.yaml

@@ -7,7 +7,7 @@ jobs:
   sync-branch:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Merge main -> versioned
         uses: devmasx/merge-branch@master