fix(hive): Update postgresql driver to 42.6.0

[sbernauer]

Description

Fixes stackabletech/hive-operator#170
Needs #454

Definition of Done Checklist

• Not all of these items are applicable to all PRs, the author should update this template to only leave the boxes in that are relevant
• Please make sure all these things are done and tick the boxes

- [x] Changes are OpenShift compatible
- [x] All added packages (via microdnf or otherwise) have a comment on why they are added
- [x] Things not downloaded from Red Hat repositories should be mirrored in the Stackable repository and downloaded from there
- [x] All packages should have (if available) signatures/hashes verified
- [ ] Does your change affect an SBOM? Make sure to update all SBOMs

[lfrancke]

Looking good to me apart from the one comment you already left yourself