Bump actions/download-artifact (#171)

Bumps the github_actions group with 1 update in the /.github/workflows directory: [actions/download-artifact](https://github.com/actions/download-artifact).


Updates `actions/download-artifact` from 3 to 4.1.7
- [Release notes](https://github.com/actions/download-artifact/releases)
- [Commits](actions/download-artifact@v3...v4.1.7)

---
updated-dependencies:
- dependency-name: actions/download-artifact
  dependency-type: direct:production
  dependency-group: github_actions
...

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

.github/workflows/deploy-app-engine.yaml

@@ -48,7 +48,7 @@ jobs:
           service_account: ${{ vars.GCP_SERVICE_ACCOUNT }}
           project_id: ${{ vars.GCP_PROJECT_ID }}
       - name: Download deployment package artifact
-        uses: actions/download-artifact@v3
+        uses: actions/download-artifact@v4.1.7
         with:
           name: app-engine
       - name: Unzip deployment package