Bump go.opentelemetry.io/build-tools/multimod from 0.8.0 to 0.12.0 in /internal/tools #693

Job	Run time
govulncheck	2m 0s
setup-environment	30s
unittest (1.20)	5m 14s
checks	2m 33s
lint	3m 33s
unittest (1.19)	4m 27s
cross-build-collector (darwin, amd64)	1m 26s
test-coverage	5m 8s
cross-build-collector (darwin, arm64)	1m 4s
cross-build-collector (linux, 386)	1m 12s
cross-build-collector (linux, amd64)	32s
cross-build-collector (linux, arm64)	1m 5s
cross-build-collector (linux, ppc64le)	1m 12s
cross-build-collector (linux, arm, 7)	1m 3s
cross-build-collector (windows, 386)	1m 25s
cross-build-collector (windows, amd64)	1m 2s
	33m 26s

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