Bump actions/checkout from 3 to 4

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](actions/checkout@v3...v4)

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

Signed-off-by: dependabot[bot] <[email protected]>

.github/workflows/integration.yml

@@ -217,15 +217,15 @@ jobs:
     steps:
       - name: Check out the repository
         if: github.event_name != 'pull_request_target'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
 
       # explicity checkout the branch for the PR,
       # this is necessary for the `pull_request_target` event
       - name: Check out the repository (PR)
         if: github.event_name == 'pull_request_target'
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           persist-credentials: false
           ref: ${{ github.event.pull_request.head.sha }}