Upgrade `kas-grpc` gem for git push events

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/119077



Merged-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: Vitali Tatarintev <vtatarintev@gitlab.com>
Approved-by: Aakriti Gupta <agupta@gitlab.com>
Reviewed-by: Aakriti Gupta <agupta@gitlab.com>
Co-authored-by: Timo Furrer <tfurrer@gitlab.com>