[Snyk] Upgrade io.grpc:grpc-protobuf from 1.15.1 to 1.31.1#1

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snyk-upgrade-5e6be1c322eea060a442898937bad989

Commits on Sep 3, 2020

fix: upgrade io.grpc:grpc-protobuf from 1.15.1 to 1.31.1
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