BUG: Fix function signature mismatch for set_clim

The dummy parent class introduced in matplotlib#13234 had a `set_clim` with a
different signature to the version in `ScalarMappable`.
This caused code which called it and passed both arguments to fail,
rather than simply no-op.

Author: ksunden

lib/matplotlib/colorbar.py

@@ -331,7 +331,7 @@ def set_cmap(self, cmap):
         pass
 
     @cbook.deprecated("3.1", alternative="ScalarMappable.set_clim")
-    def set_clim(self, cmap):
+    def set_clim(self, vmin=None, vmax=None):
         """
         `.colorbar.Colorbar.set_clim` does nothing; set the limits on
         the mappable associated with this colorbar.