Bump github.com/golang/protobuf from 1.5.2 to 1.5.4

[dependabot[bot]]

Bumps github.com/golang/protobuf from 1.5.2 to 1.5.4.

Release notes

Sourced from github.com/golang/protobuf's releases.

v1.5.4

Notable changes

• update descriptor.proto to latest version

v1.5.3

Notable changes

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

Commits

• 75de7c0 Merge pull request #1597 from golang/updatedesc
• b7697bb all: update descriptor.proto to latest version
• 5d5e8c0 Merge pull request #1363 from neild/jsonnull
• 37828f9 jsonpb: accept 'null' as a valid representation of NullValue in unmarshal
• See full diff in compare view

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