Bump go.opentelemetry.io/build-tools/multimod from 0.6.0 to 0.16.0 in /internal/tools #724

Job	Run time
setup-environment	2m 38s
checks	27s
cross-build-collector (darwin, amd64)	45s
cross-build-collector (darwin, arm64)	43s
lint	1m 14s
cross-build-collector (linux, 386)	51s
cross-build-collector (linux, amd64)	44s
cross-build-collector (linux, arm64)	49s
test-coverage	3m 36s
unittest (1.20)	5m 22s
cross-build-collector (linux, ppc64le)	48s
unittest (1.19)	5m 11s
cross-build-collector (linux, arm)	45s
cross-build-collector (windows, 386)	43s
cross-build-collector (windows, amd64)	49s
	25m 25s

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