Update Prometheus gem to version that explicitly calls `munmap`

...when mmap is no longer needed to mitigate the problems with SIGBUS

prometheus gem also introduced better way to configure it, which we are switching to as well

Are there points in the code the reviewer needs to double check?

Why was this MR needed?

SIGBUS errors are crashing app instances.

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

• Tests
  • All builds are passing
• Conform by the merge request performance guides
• Conform by the style guides
• Branch has no merge conflicts with master (if it does - rebase it please)
• Squashed related commits together

What are the relevant issue numbers?

#34723 (closed)