Bump kustomize versions

[friegger]

• to what is bundled with kubectl 1.34.x and 1.35.x

Fixes #589

Summary by CodeRabbit

• Chores
  • Updated the Kustomize validation tooling to version 5.7.1.
  • No changes to application functionality or validation workflow behavior.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: f53f9ca0-7ba1-402b-a1da-8f4fe2817c35

📥 Commits

Reviewing files that changed from the base of the PR and between 5feaf5f and 2ea59ea.

📒 Files selected for processing (1)

• .github/workflows/kustomize-validation.yml

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📝 Walkthrough

Walkthrough

The Kustomize validation workflow updates its configured Kustomize version from 5.0.0 to 5.7.1.

Changes

Kustomize validation

Layer / File(s)	Summary
Update validation Kustomize version .github/workflows/kustomize-validation.yml	The validation job now configures Kustomize 5.7.1 instead of 5.0.0.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related issues

• ironcore-dev/ironcore issue 1521 — The Kustomize version update aligns with fixing Kustomize deprecation warnings in project manifests.

Suggested reviewers: afritzler

🚥 Pre-merge checks | ✅ 2 | ❌ 3

❌ Failed checks (3 warnings)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description is too sparse and does not follow the required Proposed Changes template.	Add the three Proposed Changes bullets and keep the Fixes # reference in the repository template format.
Linked Issues check	⚠️ Warning	The PR updates a workflow version but does not replace patchesStrategicMerge with patches as required by #589.	Update the kustomizations to use patches instead of patchesStrategicMerge and verify the warning is eliminated.
Out of Scope Changes check	⚠️ Warning	The version bump in the validation workflow is unrelated to the linked issue's deprecation fix.	Limit the PR to the kustomization deprecation fix or clarify the issue being addressed by the workflow change.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title matches the main change: updating kustomize versions.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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