Update kubeclient to 4.9.2

What does this MR do?

Fixes a Ruby 3 incompatibility with a kubeclient dependency (recursive-open-struct) by bumping its patch level.

See https://gitlab.com/gitlab-org/gitlab/-/jobs/1411331237.

Updated via bundle update --conservative kubeclient.

Cf:

• https://github.com/abonas/kubeclient/blob/master/CHANGELOG.md#492--2021-05-30
• https://github.com/aetherknight/recursive-open-struct/blob/main/CHANGELOG.md#113--20201015

Does this MR meet the acceptance criteria?

Conformity

• I have included changelog trailers, or none are needed. (Does this MR need a changelog?)
• I have added/updated documentation, or it's not needed. (Is documentation required?)
• I have properly separated EE content from FOSS, or this MR is FOSS only. (Where should EE code go?)
• I have added information for database reviewers in the MR description, or it's not needed. (Does this MR have database related changes?)
• I have self-reviewed this MR per code review guidelines.
• This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)
• I have followed the style guides.
• This change is backwards compatible across updates, or this does not apply.