chore(deps): pin rossjrw/pr-preview-action action to 9f77b1d

Author: renovate[bot]

.github/workflows/pages.yaml

@@ -29,7 +29,7 @@ jobs:
     if: github.event_name == 'pull_request' && github.event.action == 'closed'
     runs-on: ubuntu-latest
     steps:
-      - uses: rossjrw/pr-preview-action@v1
+      - uses: rossjrw/pr-preview-action@9f77b1d057b494e662c50b8ca40ecc63f21e0887 # v1
         with:
           action: remove