Chore(deps): Bump github.com/golang/protobuf from 1.4.3 to 1.5.1 (#32199)

Bumps [github.com/golang/protobuf](https://github.com/golang/protobuf) from 1.4.3 to 1.5.1.
- [Release notes](https://github.com/golang/protobuf/releases)
- [Commits](https://github.com/golang/protobuf/compare/v1.4.3...v1.5.1)

Signed-off-by: dependabot[bot] <support@github.com>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

go.mod

@@ -36,7 +36,7 @@ require (
 	github.com/go-stack/stack v1.8.0
 	github.com/gobwas/glob v0.2.3
 	github.com/golang/mock v1.5.0
-	github.com/golang/protobuf v1.4.3
+	github.com/golang/protobuf v1.5.1
 	github.com/google/go-cmp v0.5.5
 	github.com/google/uuid v1.2.0
 	github.com/gosimple/slug v1.9.0