Upgrade to PostgreSQL to 16.8 not possible

Summary

Upgrade to PostgreSQL 16.8 is not possible, due to Bitnami not shipping fresh containers for versions other than the current stable (which is PostgreSQL 17 already). See also https://github.com/bitnami/containers/issues/80051.

Steps to reproduce

Upgrade PostgreSQL as described in https://docs.gitlab.com/charts/installation/database_upgrade.

Current behavior

When configuring postgresql.image.tag to 16.8, the container can't be pulled due to not being available.

Expected behavior

Container can be pulled correctly in the desired version.

Versions

• Chart: 8.11.2
• Platform:
  • Self-hosted: microk8s
• Kubernetes: v1.29.15

This will be a problem because there is no other postgresql chart available apart from the one created by bitnami...