Integrate

Migrate `protobuf` to version 3.7.1 #26

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Run time

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Job	Run time
CI (ubuntu-latest, stable)	35s
CI (ubuntu-latest, nightly)	30s
CI (macos-latest, stable)	26s
CI (macos-latest, nightly)	33s
CI (windows-latest, stable)	1m 55s
CI (windows-latest, nightly)	1m 44s
	5m 43s