chore: Release stackable-operator 0.81.0

[sbernauer]

Description

Added

• Add new PreferredAddressType::HostnameConservative (#903).

Changed

• BREAKING: Split ListenerClass.spec.preferred_address_type into a new PreferredAddressType type. Use resolve_preferred_address_type() to access the AddressType as before. (#903)

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

# Author
- [ ] Changes are OpenShift compatible
- [ ] CRD changes approved
- [ ] Integration tests passed (for non trivial changes)

# Reviewer
- [ ] Code contains useful comments
- [ ] (Integration-)Test cases added
- [ ] Documentation added or updated
- [ ] Changelog updated
- [ ] Cargo.toml only contains references to git tags (not specific commits or branches)

# Acceptance
- [ ] Feature Tracker has been updated
- [ ] Proper release label has been added