deps: bump github.com/golang/protobuf from 1.3.2 to 1.3.3 (#4359)

Bumps [github.com/golang/protobuf](https://github.com/golang/protobuf) from 1.3.2 to 1.3.3.
- [Release notes](https://github.com/golang/protobuf/releases)
- [Commits](https://github.com/golang/protobuf/compare/v1.3.2...v1.3.3)

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

go.mod

@@ -12,7 +12,7 @@ require (
 	github.com/go-kit/kit v0.9.0
 	github.com/go-logfmt/logfmt v0.5.0
 	github.com/gogo/protobuf v1.3.1
-	github.com/golang/protobuf v1.3.2
+	github.com/golang/protobuf v1.3.3
 	github.com/google/gofuzz v1.0.0 // indirect
 	github.com/gorilla/websocket v1.4.1
 	github.com/gtank/merlin v0.1.1-0.20191105220539-8318aed1a79f

go.sum

@@ -82,6 +82,8 @@ github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5y
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.2 h1:6nsPYzhq5kReh6QImI3k5qWzO4PEbvbIW2cwSfR/6xs=
 github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.3 h1:gyjaxf+svBWX08ZjK86iN9geUJF0H6gp2IRKX6Nf6/I=
+github.com/golang/protobuf v1.3.3/go.mod h1:vzj43D7+SQXF/4pzW/hwtAqwc6iTitCiVSaWz5lYuqw=
 github.com/golang/snappy v0.0.1 h1:Qgr9rKW7uDUkrbSmQeiDsGa8SjGyCOGtuasMWwvp2P4=
 github.com/golang/snappy v0.0.1/go.mod h1:/XxbfmMg8lxefKM7IXC3fBNl/7bRcc72aCRzEWrmP2Q=
 github.com/google/btree v1.0.0/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=