--- a/mercurial/revlogutils/nodemap.py	Mon Feb 21 13:03:43 2022 -0700
+++ b/mercurial/revlogutils/nodemap.py	Mon Feb 21 13:08:28 2022 -0700
@@ -113,7 +113,7 @@
     tr.addfinalize(callback_id, lambda tr: persist_nodemap(tr, revlog))
 
 
-class _NoTransaction(object):
+class _NoTransaction:
     """transaction like object to update the nodemap outside a transaction"""
 
     def __init__(self):
@@ -304,7 +304,7 @@
 S_HEADER = struct.Struct(">BQQQQ")
 
 
-class NodeMapDocket(object):
+class NodeMapDocket:
     """metadata associated with persistent nodemap data
 
     The persistent data may come from disk or be on their way to disk.