fix: add tzdata to superset image

[adwk67]

Description

• Redhat has removed tzdata from the ubi-minimal images. See here and here.
• Superset relies on ZoneInfo to resolve time zones, and this is done by searching first under TZPATH (which is empty due to the point above) or for the tzdata python package.
• That package is added in this PR (airflow already has tzdata in its list of dependencies).

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

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

[sbernauer]

Thanks for the catch and the nice description!
Could you please add the description as comment above the package, so that we keep this valuable information?

[adwk67]

Thanks for the catch and the nice description! Could you please add the description as comment above the package, so that we keep this valuable information?

Done!

[NickLarsenNZ]

LGTM