Bump go.opentelemetry.io/otel/exporters/prometheus from 0.36.0 to 0.40.0 #561

Job	Run time
setup-environment	38s
test-coverage	1m 10s
checks	27s
lint	2m 1s
cross-build-collector (darwin, amd64)	12s
cross-build-collector (darwin, arm64)	14s
cross-build-collector (linux, 386)	15s
cross-build-collector (linux, amd64)	7s
cross-build-collector (linux, arm64)	13s
cross-build-collector (linux, ppc64le)	19s
cross-build-collector (linux, arm)	12s
cross-build-collector (windows, 386)	13s
cross-build-collector (windows, amd64)	9s
unittest (1.20)	45s
unittest (1.19)	43s
	7m 38s

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