PyAPI: move deep-copy args check to py_capi_utils

source/blender/python/mathutils/mathutils_Vector.c

@@ -1331,8 +1331,9 @@ static PyObject *Vector_copy(VectorObject *self)
 }
 static PyObject *Vector_deepcopy(VectorObject *self, PyObject *args)
 {
-	if (!mathutils_deepcopy_args_check(args))
+	if (!PyC_CheckArgs_DeepCopy(args)) {
 		return NULL;
+	}
 	return Vector_copy(self);
 }