Update Prometheus gem to fix problems with other Processes overwriting current metrics file

What does this MR do?

Update Prometheus Gem version

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

Why was this MR needed?

Previous prometheus gem version had problem with other processes overwriting its metrics storage files

Screenshots (if relevant)

Does this MR meet the acceptance criteria?

What are the relevant issue numbers?

Closes: gitlab-ce#36714

Edited by Paweł Chojnacki

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