vendor: Update github.com/gogo/protobuf, keeping all files

gvt fetch -a, because we need the protobuf files etc for regeneration

vendor/github.com/gogo/protobuf/test/enumdecl_all/enumdeclall.proto

@@ -0,0 +1,35 @@
+syntax = "proto3";
+
+package enumdeclall;
+
+import "github.com/gogo/protobuf/gogoproto/gogo.proto";
+
+option (gogoproto.testgen_all) = true;
+option (gogoproto.populate_all) = true;
+option (gogoproto.benchgen_all) = true;
+option (gogoproto.unmarshaler_all) = true;
+option (gogoproto.marshaler_all) = true;
+option (gogoproto.sizer_all) = true;
+option (gogoproto.equal_all) = true;
+option (gogoproto.verbose_equal_all) = true;
+option (gogoproto.unsafe_marshaler_all) = false;
+option (gogoproto.unsafe_unmarshaler_all) = false;
+option (gogoproto.enumdecl_all) = false;
+
+enum MyEnum {
+    option (gogoproto.goproto_enum_prefix) = false;
+    A = 0;
+    B = 1;
+}
+
+enum MyOtherEnum {
+    option (gogoproto.enumdecl) = true;
+    option (gogoproto.goproto_enum_prefix) = false;
+    C = 0;
+    D = 1;
+}
+
+message Message {
+    MyEnum enumerated_field = 1;
+    MyOtherEnum otherenumerated_field = 2;
+}