Update module github.com/prometheus/client_model to v0.6.1

vendor/google.golang.org/protobuf/internal/strs/strings.go

@@ -17,7 +17,7 @@ import (
 
 // EnforceUTF8 reports whether to enforce strict UTF-8 validation.
 func EnforceUTF8(fd protoreflect.FieldDescriptor) bool {
-	if flags.ProtoLegacy {
+	if flags.ProtoLegacy || fd.Syntax() == protoreflect.Editions {
 		if fd, ok := fd.(interface{ EnforceUTF8() bool }); ok {
 			return fd.EnforceUTF8()
 		}