Bump go.opentelemetry.io/otel/exporters/prometheus from 0.42.0 to 0.44.0 in /service #799

Job	Run time
govulncheck	1m 12s
setup-environment	31s
test-coverage	1m 28s
checks	38s
cross-build-collector (darwin, amd64)	11s
lint	1m 27s
unittest-matrix (~1.21.3)	1m 20s
cross-build-collector (darwin, arm64)	15s
unittest-matrix (~1.20.10)	1m 26s
cross-build-collector (linux, 386)	12s
cross-build-collector (linux, amd64)	7s
cross-build-collector (linux, arm64)	15s
cross-build-collector (linux, ppc64le)	7s
cross-build-collector (linux, arm, 7)	11s
cross-build-collector (linux, s390x)	15s
cross-build-collector (windows, 386)	17s
cross-build-collector (windows, amd64)	16s
unittest	1s
	10m 9s

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