gh-92810: Apply fixes

dolfinus · dolfinus · commit 1c64b4ae87bf · 2025-03-31T14:25:21.000+03:00
Signed-off-by: Martynov Maxim &lt;martinov_m_s_@mail.ru&gt;
diff --git a/Lib/_py_abc.py b/Lib/_py_abc.py
@@ -1,7 +1,5 @@
 from _weakrefset import WeakSet
 
-_UNSET = object()
-
 
 def get_cache_token():
     """Returns the current ABC cache token.
