Merge branch 'renovate-workhorse/github.com-prometheus-client_golang-1.x' into 'master'

workhorse: Update module github.com/prometheus/client_golang to v1.15.0

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/118209



Merged-by: Ash McKenzie <amckenzie@gitlab.com>
Approved-by: Ash McKenzie <amckenzie@gitlab.com>
Co-authored-by: GitLab Renovate Bot <gitlab-bot@gitlab.com>