build: bump prometheus client to 1.12.1 (!705) · Merge requests · GitLab.org / gitlab-pages · GitLab

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What does this MR do?

TODO

I added the Changelog trailer (e.g. Changelog: added) to the commits that need to be included in the changelog
I added unit tests or they are not required
I added acceptance tests or they are not required
I added documentation (or it's not required)
I followed code review guidelines
I followed Go Style guidelines