Bump go.opentelemetry.io/otel/sdk/metric from 1.19.0 to 1.20.0 in /processor/batchprocessor #788

Job	Run time
govulncheck	1m 17s
setup-environment	36s
checks	33s
cross-build-collector (darwin, amd64)	11s
cross-build-collector (darwin, arm64)	9s
lint	1m 26s
test-coverage	1m 24s
cross-build-collector (linux, 386)	15s
unittest-matrix (~1.21.3)	1m 16s
cross-build-collector (linux, amd64)	14s
unittest-matrix (~1.20.10)	1m 15s
cross-build-collector (linux, arm64)	16s
cross-build-collector (linux, ppc64le)	11s
cross-build-collector (linux, arm, 7)	8s
cross-build-collector (linux, s390x)	11s
cross-build-collector (windows, 386)	7s
cross-build-collector (windows, amd64)	13s
unittest	1s
	9m 43s

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