diff -r 55d132525155 -r 642e31cb55f0 mercurial/utils/stringutil.py
--- a/mercurial/utils/stringutil.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/utils/stringutil.py	Mon Feb 21 13:08:28 2022 -0700
@@ -496,7 +496,7 @@
 
 
 @attr.s(hash=True)
-class mailmapping(object):
+class mailmapping:
     """Represents a username/email key or value in
     a mailmap file"""