Bump azure/setup-kubectl from 3 to 4 (#398)

Bumps [azure/setup-kubectl](https://github.com/azure/setup-kubectl) from 3 to 4.
- [Release notes](https://github.com/azure/setup-kubectl/releases)
- [Changelog](https://github.com/Azure/setup-kubectl/blob/main/CHANGELOG.md)
- [Commits](Azure/setup-kubectl@v3...v4)

---
updated-dependencies:
- dependency-name: azure/setup-kubectl
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

.github/workflows/database-backup.yml

@@ -34,7 +34,7 @@ jobs:
         azure-credentials: ${{ secrets.AZURE_CREDENTIALS_PRODUCTION }}
 
     - name: Install kubectl
-      uses: azure/setup-kubectl@v3
+      uses: azure/setup-kubectl@v4
       with:
         version: "v1.26.1" # default is latest stable