ci: update workflow versions weekly, if possible

.github/workflows/updater.yml

@@ -0,0 +1,33 @@
+name: GitHub Actions Version Updater
+# https://github.com/saadmk11/github-actions-version-updater?tab=readme-ov-file
+
+# Controls when the action will run.
+on:
+  # can be used to run workflow manually
+  workflow_dispatch:
+  schedule:
+    # Automatically run on every Sunday
+    - cron: "0 0 * * 0"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          # [Required] Access token with `workflow` scope.
+          token: ${{ secrets.WORKFLOW_SECRET }}
+
+      - name: Run GitHub Actions Version Updater
+        uses: saadmk11/[email protected]
+        # Required to get the PR number
+        id: gha-update
+        with:
+          # [Required] Access token with `workflow` scope.
+          token: ${{ secrets.WORKFLOW_SECRET }}
+          skip_pull_request: "false"
+      - name: Get PR Number
+        run:
+          echo "The PR Number is ${{
+          steps.gha-update.outputs.GHA_UPDATE_PR_NUMBER }}"