build(deps): Bump github.com/golang/protobuf from 1.4.3 to 1.5.1

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](golang/protobuf@v1.4.3...v1.5.1)

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

go.mod

@@ -9,11 +9,10 @@ require (
 	github.com/go-cmd/cmd v1.3.0
 	github.com/go-logr/logr v0.4.0
 	github.com/go-logr/zapr v0.4.0
-	github.com/golang/protobuf v1.4.3
-	github.com/google/go-cmp v0.5.3 // indirect
+	github.com/golang/protobuf v1.5.1
 	github.com/google/go-github/v32 v32.1.0
 	github.com/google/shlex v0.0.0-20191202100458-e7afc7fbc510
-	github.com/hashicorp/go-multierror v1.1.0
+	github.com/hashicorp/go-multierror v1.1.1
 	github.com/joho/godotenv v1.3.0
 	github.com/kisielk/errcheck v1.6.0
 	github.com/magiconair/properties v1.8.4 // indirect
@@ -39,7 +38,7 @@ require (
 	golang.org/x/net v0.0.0-20201202161906-c7110b5ffcbb
 	golang.org/x/tools v0.1.0
 	google.golang.org/grpc v1.36.0
-	google.golang.org/protobuf v1.25.0
+	google.golang.org/protobuf v1.26.0
 	gopkg.in/h2non/gock.v1 v1.0.16
 	gopkg.in/ini.v1 v1.62.0 // indirect
 	honnef.co/go/tools v0.0.1-2020.1.4 // indirect