ci: bump GoogleCloudPlatform/release-please-action from 3 to 4

Bumps [GoogleCloudPlatform/release-please-action](https://github.com/googlecloudplatform/release-please-action) from 3 to 4.
- [Release notes](https://github.com/googlecloudplatform/release-please-action/releases)
- [Changelog](https://github.com/google-github-actions/release-please-action/blob/main/CHANGELOG.md)
- [Commits](googleapis/release-please-action@v3...v4)

---
updated-dependencies:
- dependency-name: GoogleCloudPlatform/release-please-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/release-please.yaml

@@ -7,7 +7,7 @@ jobs:
   release-please:
     runs-on: ubuntu-latest
     steps:
-      - uses: GoogleCloudPlatform/release-please-action@v3
+      - uses: GoogleCloudPlatform/release-please-action@v4
         id: release
         with:
           # use the CI token to pretend not to be a action