DEPR: remove reduce kwd from DataFrame.apply (pandas-dev#29730)

Author: jbrockmendel

pandas/core/frame.py

@@ -6474,9 +6474,7 @@ def transform(self, func, axis=0, *args, **kwargs):
             return self.T.transform(func, *args, **kwargs).T
         return super().transform(func, *args, **kwargs)
 
-    def apply(
-        self, func, axis=0, raw=False, reduce=None, result_type=None, args=(), **kwds
-    ):
+    def apply(self, func, axis=0, raw=False, result_type=None, args=(), **kwds):
         """
         Apply a function along an axis of the DataFrame.