Update actions/checkout action to v4

Author: renovate[bot]

.github/workflows/pages.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
       - name: Setup Pages
         uses: actions/configure-pages@v3
       - name: Install SpectaQL