Update module github.com/prometheus/client_golang to v1.18.0 #16478

Job	Run time
govulncheck	59s
setup-environment	26s
unittest-matrix (~1.21.5)	4m 53s
checks	1m 37s
unittest-matrix (~1.20.12)	4m 11s
lint	3m 8s
cross-build-collector (darwin, amd64)	35s
cross-build-collector (darwin, arm64)	36s
test-coverage	4m 25s
cross-build-collector (linux, 386)	35s
cross-build-collector (linux, amd64)	39s
cross-build-collector (linux, arm64)	36s
cross-build-collector (linux, ppc64le)	37s
cross-build-collector (linux, arm, 7)	42s
cross-build-collector (linux, s390x)	39s
cross-build-collector (windows, 386)	38s
cross-build-collector (windows, amd64)	35s
unittest	1s
	25m 52s

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