fix(deps): update module github.com/golang/protobuf to v1.5.4

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
github.com/golang/protobuf	v1.4.3 -> v1.5.4

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Release Notes

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

v1.5.4

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Notable changes

• update descriptor.proto to latest version

v1.5.3

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Notable changes

*( #​1363) jsonpb: accept 'null' as a valid representation of NullValue in unmarshal

v1.5.2

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Notable changes:

• (#​1306) all: deprecate the module
• (#​1300) jsonpb: restore previous behavior for handling nulls and JSONPBUnmarshaler

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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