python: remove aenum in favor of stdlib's enum (#16691)

The aenum dependency didn't provide any specific improvements over the
stdlib's enum module.
aenum also doesn't provide typing information at the moment.

This removes one dependency and will help for completing the typing of
the generated client.

samples/client/echo_api/python/openapi_client/models/string_enum_ref.py

@@ -13,10 +13,11 @@
 """  # noqa: E501
 
 
+from __future__ import annotations
 import json
 import pprint
 import re  # noqa: F401
-from aenum import Enum, no_arg
+from enum import Enum
 
 
 

samples/client/echo_api/python/pyproject.toml

@@ -15,7 +15,6 @@ python = "^3.7"
 urllib3 = ">= 1.25.3"
 python-dateutil = ">=2.8.2"
 pydantic = ">=2"
-aenum = ">=3.1.11"
 typing-extensions = ">=4.7.1"
 
 [tool.poetry.dev-dependencies]

samples/client/echo_api/python/requirements.txt

@@ -2,5 +2,4 @@ python_dateutil >= 2.5.3
 setuptools >= 21.0.0
 urllib3 >= 1.25.3, < 2.1.0
 pydantic >= 2
-aenum >= 3.1.11
 typing-extensions >= 4.7.1

samples/client/echo_api/python/setup.py

@@ -28,7 +28,6 @@ REQUIRES = [
     "urllib3 >= 1.25.3, < 2.1.0",
     "python-dateutil",
     "pydantic >= 2",
-    "aenum",
     "typing-extensions >= 4.7.1",
 ]