remove deprecated copy

Author: MarcoGorelli

pandas-stubs/core/frame.pyi

@@ -2555,9 +2555,7 @@ class DataFrame(NDFrame, OpsMixin, _GetItemHack):
         **kwargs: Any,
     ) -> Series: ...
     # Not actually positional, but used to handle removal of deprecated
-    def set_axis(
-        self, labels: AxesData, *, axis: Axis = 0, copy: _bool = ...
-    ) -> Self: ...
+    def set_axis(self, labels: AxesData, *, axis: Axis = 0) -> Self: ...
     def skew(
         self,
         axis: Axis | None = ...,