Bump google.golang.org/protobuf from 1.28.1 to 1.34.2 in /exporter/otlphttpexporter #844

Job	Run time
setup-environment	29s
test-coverage	1m 17s
unittest (1.20)	1m 17s
checks	30s
cross-build-collector (darwin, amd64)	20s
unittest (1.19)	1m 14s
cross-build-collector (darwin, arm64)	20s
cross-build-collector (linux, 386)	16s
lint	1m 31s
cross-build-collector (linux, amd64)	21s
cross-build-collector (linux, arm64)	17s
cross-build-collector (linux, ppc64le)	21s
cross-build-collector (linux, arm)	17s
cross-build-collector (windows, 386)	15s
cross-build-collector (windows, amd64)	22s
	9m 7s

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