Add KAS Version Maintainers to CODEOWNERS file
What does this MR do and why?
This MR adds the newly created Kas Version Maintainers group to the codeowners file, see this AR for more context: https://gitlab.com/gitlab-com/team-member-epics/access-requests/-/issues/24813
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.