scipy1.15 change: look in kwargs for minimizer_kwargs

(cherry picked from commit b58c655)

gempy/library/matching.py

@@ -396,7 +396,7 @@ def bounds_for_unfixed_parameters(m):
         if self._method is not None:
             kwargs['method'] = self._method
 
-        if 'minimizer_kwargs' in arg_names:
+        if 'minimizer_kwargs' in kwarg_names:
             kwargs['minimizer_kwargs'] = {'args': farg,
                                           'method': 'Nelder-Mead'}