Instances of baseCenum is not treated as int by ctypes in python3.11

[larsevj]

Describe the bug
When prototype.call is used on a function expecting an int and you give it an instance of basecenum it will give you a ValueError in python3.11, due to stricter type enforcements.

To Reproduce
Run resdata tests onprem, or run this script:

from cwrap import BaseCEnum
from resdata.resfile import ResdataFile
from resdata import FileMode
  
f1 = ResdataFile("some_file.some", index_filename="index")

will faile with TypeError on python3.11 while it fails on file not found for python3.8.