Bump google.golang.org/protobuf from 1.28.1 to 1.35.2 in /exporter/otlphttpexporter #913

Job	Run time
setup-environment	2m 42s
test-coverage	1m 15s
lint	1m 39s
cross-build-collector (darwin, amd64)	21s
checks	29s
cross-build-collector (darwin, arm64)	22s
unittest (1.20)	1m 18s
cross-build-collector (linux, 386)	15s
unittest (1.19)	1m 16s
cross-build-collector (linux, amd64)	16s
cross-build-collector (linux, arm64)	17s
cross-build-collector (linux, ppc64le)	14s
cross-build-collector (linux, arm)	14s
cross-build-collector (windows, 386)	14s
cross-build-collector (windows, amd64)	14s
	11m 6s

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