Kubeclient bump

What does this MR do?

https://github.com/abonas/kubeclient/compare/v4.6.0...v4.9.1

Bumps kubeclient to 4.9.1

This includes Ruby 2.7 compat fixes and also addresses #22043 (closed)

Screenshots

Installing GitLab-managed apps (which involves creating pods and configmaps using Kubeclient) succeeds:

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• [-] Documentation (if required)
• Code review guidelines
• Merge request performance guidelines
• Style guides
• [-] Database guides
• [-] Separation of EE specific content

Availability and Testing

• Review and add/update tests for this feature/bug. Consider all test levels. See the Test Planning Process.