Bump SonarSource/sonarqube-scan-action from 5 to 6

Bumps [SonarSource/sonarqube-scan-action](https://github.com/sonarsource/sonarqube-scan-action) from 5 to 6.
- [Release notes](https://github.com/sonarsource/sonarqube-scan-action/releases)
- [Commits](SonarSource/sonarqube-scan-action@v5...v6)

---
updated-dependencies:
- dependency-name: SonarSource/sonarqube-scan-action
  dependency-version: '6'
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/sonar.yml

@@ -49,7 +49,7 @@ jobs:
 
       - name: SonarQube Scan
         if: ${{ (github.event_name == 'push') || (github.event.pull_request.head.repo.owner.login == 'PowerGridModel') }}
-        uses: SonarSource/sonarqube-scan-action@v5
+        uses: SonarSource/sonarqube-scan-action@v6
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
           SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}