update vendor

vendor/google.golang.org/protobuf/proto/merge.go

@@ -21,7 +21,7 @@ import (
 // The unknown fields of src are appended to the unknown fields of dst.
 //
 // It is semantically equivalent to unmarshaling the encoded form of src
-// into dst with the UnmarshalOptions.Merge option specified.
+// into dst with the [UnmarshalOptions.Merge] option specified.
 func Merge(dst, src Message) {
 	// TODO: Should nil src be treated as semantically equivalent to a
 	// untyped, read-only, empty message? What about a nil dst?
@@ -59,6 +59,12 @@ func Clone(m Message) Message {
 	return dst.Interface()
 }
 
+// CloneOf returns a deep copy of m. If the top-level message is invalid,
+// it returns an invalid message as well.
+func CloneOf[M Message](m M) M {
+	return Clone(m).(M)
+}
+
 // mergeOptions provides a namespace for merge functions, and can be
 // exported in the future if we add user-visible merge options.
 type mergeOptions struct{}