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](https://github.com/golang/protobuf/compare/v1.4.3...v1.5.1)

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

Gopkg.lock

@@ -62,12 +62,12 @@
   version = "v1.1.1"
 
 [[projects]]
-  digest = "1:6532affeeaaccdc6919d5773516176b77de02b4af8cf9a7fac16bae77aa319c5"
+  digest = "1:64f493658090ddd1195cd151849a9aca33c7834f185a8d2e068fb2b7f03f80d6"
   name = "github.com/golang/protobuf"
   packages = ["proto"]
   pruneopts = ""
-  revision = "4846b58453b3708320bdb524f25cc5a1d9cda4d4"
+  revision = "a36a1a1c346d5cb6951b9440755adb530334f910"
-  version = "v1.4.3"
+  version = "v1.5.1"
 
 [[projects]]
   branch = "master"
@@ -169,10 +169,12 @@
     "internal/strs",
     "internal/version",
     "proto",
+    "reflect/protodesc",
     "reflect/protoreflect",
     "reflect/protoregistry",
     "runtime/protoiface",
     "runtime/protoimpl",
+    "types/descriptorpb",
   ]
   pruneopts = ""
   revision = "3f7a61f89bb6813f89d981d1870ed68da0b3c3f1"