diff -r 4f153a23adab -r 6d9efbef00a9 vendor/google.golang.org/protobuf/internal/impl/codec_map_go112.go
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/vendor/google.golang.org/protobuf/internal/impl/codec_map_go112.go	Sun Jul 11 10:35:56 2021 +0200
@@ -0,0 +1,11 @@
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build go1.12
+
+package impl
+
+import "reflect"
+
+func mapRange(v reflect.Value) *reflect.MapIter { return v.MapRange() }