Update module golang/protobuf to v1.5.1

This MR contains the following updates:

Package	Type	Update	Change
github.com/golang/protobuf	require	minor	v1.4.3 -> v1.5.1

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Release Notes

golang/protobuf

v1.5.1

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Notable changes:

• (#​1293) all: depend on google.golang.org/protobuf@v1.26.0

v1.5.0

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• Overview
• Notable changes

Overview

This marks the ptypes package as deprecated and upgrades the dependency on google.golang.org/protobuf to a pre-release version of v1.26.0. A subsequent patch release will update the dependency to v1.26.0 proper.

Notable changes

• (#​1217) ptypes: deprecate the package
• (#​1214) rely on protodesc.ToFileDescriptorProto

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