[sonarqube] Outdated database dependency

[MrKrabat]

Sonarqube still uses bitnami's postgresql helm chart with version 8 as dependency: https://github.com/Oteemo/charts/blob/master/charts/sonarqube/requirements.yaml

But bitnami is already at version 10:
https://github.com/bitnami/charts/blob/master/bitnami/postgresql/Chart.yaml

To get the latest security updates, you should update the dependency.