Fix broken link to metadata schema (#9044) #841

Job	Run time
setup-environment	35s
govulncheck	1m 12s
test-coverage	4m 18s
unittest-matrix (~1.21.4)	4m 36s
unittest-matrix (~1.20.11)	3m 59s
checks	1m 41s
cross-build-collector (darwin, amd64)	41s
lint	3m 4s
cross-build-collector (darwin, arm64)	35s
cross-build-collector (linux, 386)	35s
cross-build-collector (linux, amd64)	34s
cross-build-collector (linux, arm64)	35s
cross-build-collector (linux, ppc64le)	40s
cross-build-collector (linux, arm, 7)	38s
cross-build-collector (linux, s390x)	40s
cross-build-collector (windows, 386)	34s
cross-build-collector (windows, amd64)	43s
unittest	1s
	25m 41s

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