Bump prometheus to 3.8.1 #868

Job	Run time
kitchen / prepare-matrix	2s
kitchen / run-kitchen-tests (centos-stream-9)	2m 37s
kitchen / run-kitchen-tests (centos-stream-10)	2m 3s
kitchen / run-kitchen-tests (ubuntu-2404)	1m 59s
kitchen / run-kitchen-tests (fedora-40)	2m 0s
kitchen / run-kitchen-tests (ubuntu-2204)	1m 50s
kitchen / run-kitchen-tests (debian-12)	1m 50s
	12m 21s

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