[Merged by Bors] - Support OPA 0.51.0

[maltesander]

Description

test: https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/opa-operator-it-custom/62/

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
- [ ] Helm chart can be installed and deployed operator works
- [ ] 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

Once the review is done, comment bors r+ (or bors merge) to merge. Further information

[sbernauer]

Thx! LGTM when integration tests pass

[maltesander]

bors merge

[bors]

Pull request successfully merged into main.

Build succeeded!

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• All tests passed