Update module github.com/golang/protobuf to v1.5.4

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/golang/protobuf	v1.5.3 -> v1.5.4

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Release Notes

golang/protobuf (github.com/golang/protobuf)

v1.5.4

Compare Source

Notable changes

• update descriptor.proto to latest version

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