Bump actions/checkout from 3 to 4 (#2719)

Bumps [actions/checkout](https://github.com/actions/checkout) from 3 to 4.
- [Release notes](https://github.com/actions/checkout/releases)
- [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md)
- [Commits](https://github.com/actions/checkout/compare/v3...v4)

---
updated-dependencies:
- dependency-name: actions/checkout
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/Auto-merge-dependabot-PRs.yml

@@ -16,7 +16,7 @@ jobs:
     env:
       GITHUB_TOKEN: ${{ secrets.AUTO_MERGE_GITHUB_TOKEN }}
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - run: |
           gh pr review ${{ github.event.pull_request.number }} --comment --body "If CI passes, this dependabot PR will be [auto-merged](https://github.com/sharkdp/bat/blob/main/.github/workflows/Auto-merge-dependabot-PRs.yml) 🚀"
       - run: |