Bump go.opentelemetry.io/otel/trace from 1.16.0 to 1.18.0 #692

Job	Run time
govulncheck	2m 3s
setup-environment	52s
lint	2m 10s
checks	32s
cross-build-collector (darwin, amd64)	22s
cross-build-collector (darwin, arm64)	13s
cross-build-collector (linux, 386)	22s
cross-build-collector (linux, amd64)	23s
cross-build-collector (linux, arm64)	12s
cross-build-collector (linux, ppc64le)	13s
cross-build-collector (linux, arm, 7)	16s
cross-build-collector (windows, 386)	19s
cross-build-collector (windows, amd64)	22s
test-coverage	1m 54s
unittest (1.20)	2m 25s
unittest (1.19)	2m 43s
	15m 21s

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