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

Update Gitaly version

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/175941



Merged-by: release-tools approver bot <project_278964_bot_77e28085fcec07f14dfd31c689824b5b@noreply.gitlab.com>
Approved-by: release-tools approver bot <project_278964_bot_77e28085fcec07f14dfd31c689824b5b@noreply.gitlab.com>
Co-authored-by: GitLab Release Tools Bot <delivery-team+release-tools@gitlab.com>

GITALY_SERVER_VERSION

-2ab2f314f8cb9bcde11f56f04effcd76f638b5ce
+b621ac4ec3d3b032489d4ac65df1ffa5752a5565