Fix update_shared_runners_service ownership in CODEOWNERS
What does this MR do and why?
This MR assigns /app/services/groups/update_shared_runners_service.rb
to @gitlab-org/ci-cd/runner-fleet-team/backend-approvers
in the CODEOWNERS file. See #417054 (closed).
How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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