vendor: Update everything

GitHub-Pull-Request: https://github.com/syncthing/syncthing/pull/4620

vendor/github.com/gogo/protobuf/test/issue8/proto.pb.go

@@ -20,7 +20,6 @@ import _ "github.com/gogo/protobuf/gogoproto"
 import bytes "bytes"
 
 import io "io"
-import github_com_gogo_protobuf_proto "github.com/gogo/protobuf/proto"
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto1.Marshal
@@ -55,10 +54,7 @@ func init() {
 }
 func (this *Foo) Equal(that interface{}) bool {
 	if that == nil {
-		if this == nil {
-			return true
-		}
-		return false
+		return this == nil
 	}
 
 	that1, ok := that.(*Foo)
@@ -71,10 +67,7 @@ func (this *Foo) Equal(that interface{}) bool {
 		}
 	}
 	if that1 == nil {
-		if this == nil {
-			return true
-		}
-		return false
+		return this == nil
 	} else if this == nil {
 		return false
 	}
@@ -242,7 +235,7 @@ func (m *Foo) Unmarshal(dAtA []byte) error {
 		}
 	}
 	if hasFields[0]&uint64(0x00000001) == 0 {
-		return github_com_gogo_protobuf_proto.NewRequiredNotSetError("bar")
+		return proto1.NewRequiredNotSetError("bar")
 	}
 
 	if iNdEx > l {