MAINT: disable the warning on 3.14 and newer

Author: ngoldbaum

pandas/core/frame.py

@@ -4213,7 +4213,7 @@ def isetitem(self, loc, value) -> None:
         self._iset_item_mgr(loc, arraylike, inplace=False, refs=refs)
 
     def __setitem__(self, key, value) -> None:
-        if not PYPY:
+        if not PYPY and sys.version_info < (3, 14):
             if sys.getrefcount(self) <= 3:
                 warnings.warn(
                     _chained_assignment_msg, ChainedAssignmentError, stacklevel=2