build(deps): bump google-github-actions/setup-gcloud from 2.1.4 to 2.1.5 (#9078)

Bumps [google-github-actions/setup-gcloud](https://github.com/google-github-actions/setup-gcloud) from 2.1.4 to 2.1.5.
- [Release notes](https://github.com/google-github-actions/setup-gcloud/releases)
- [Changelog](https://github.com/google-github-actions/setup-gcloud/blob/main/CHANGELOG.md)
- [Commits](google-github-actions/setup-gcloud@77e7a55...6a7c903)

Author: dependabot[bot]

.github/workflows/serverless-project.yml

@@ -75,7 +75,7 @@ jobs:
           project-id: "elastic-observability-ci"
 
       - name: Set up Cloud SDK
-        uses: google-github-actions/setup-gcloud@77e7a554d41e2ee56fc945c52dfd3f33d12def9a
+        uses: google-github-actions/setup-gcloud@6a7c903a70c8625ed6700fa299f5ddb4ca6022e9
 
       # TODO: as soon as the oblt-framework supports elastic-observability-ci we can avoid this step.
       # NOTE: