Remove unnecessary staticmethod decorator for cypclass __new__ test

nogil_test/cypclass_test___new__.pyx

 cdef cypclass SomeMemory:
   int a
 
-  @staticmethod
-  SomeMemory __new__(void* (*f)()):
+  SomeMemory __new__(f):
     o = <SomeMemory> f()
     o.a = -2
     return o
 
-  @staticmethod
-  void* __new__(void* (*f)(), int a):
+  void* __new__(f, int a):
     o = <SomeMemory> f()
     o.a = a
     return <void*> o
 
-  @staticmethod
   SomeMemory __alloc__():
       return new SomeMemory()