Merge branch 'release-tools/update-gitaly' into 'master'

Update Gitaly version

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/154949



Merged-by: Jennifer Li <jli@gitlab.com>
Approved-by: release-tools approver bot <project278964_bot6@example.com>
Co-authored-by: GitLab Release Tools Bot <delivery-team+release-tools@gitlab.com>

GITALY_SERVER_VERSION

-42a2e519ca55a42f8cf420012b1f14af0830be59
+839bb6949fe00d16bd0b83420853a337cfbd8307