Bump go.opentelemetry.io/otel from 1.19.0 to 1.20.0 #774

Job	Run time
setup-environment	24s
govulncheck	30s
checks	33s
lint	1m 23s
test-coverage	1m 22s
unittest-matrix (~1.21.3)	1m 17s
unittest-matrix (~1.20.10)	1m 42s
cross-build-collector (darwin, amd64)	10s
cross-build-collector (darwin, arm64)	8s
cross-build-collector (linux, 386)	8s
cross-build-collector (linux, amd64)	11s
cross-build-collector (linux, arm64)	8s
cross-build-collector (linux, ppc64le)	10s
cross-build-collector (linux, arm, 7)	7s
cross-build-collector (linux, s390x)	8s
cross-build-collector (windows, 386)	11s
cross-build-collector (windows, amd64)	11s
unittest	1s
	8m 44s

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