Bump sonarsource/sonarcloud-github-action from 1.8 to 1.9

Bumps [sonarsource/sonarcloud-github-action](https://github.com/sonarsource/sonarcloud-github-action) from 1.8 to 1.9.
- [Release notes](https://github.com/sonarsource/sonarcloud-github-action/releases)
- [Commits](https://github.com/sonarsource/sonarcloud-github-action/compare/v1.8...v1.9)

---
updated-dependencies:
- dependency-name: sonarsource/sonarcloud-github-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/backend_tests.yml

@@ -276,7 +276,7 @@ jobs:
         uses: codecov/codecov-action@v3.1.3
 
       - name: SonarCloud Scan
-        uses: sonarsource/sonarcloud-github-action@v1.8
+        uses: sonarsource/sonarcloud-github-action@v1.9
         # thought about just skipping dependabot
         # if: ${{ github.actor != 'dependabot[bot]' }}
         # but figured all pull requests seems better, since none of them will have access to sonarcloud.