Steps to Reproduce

1. pip install python-telegram-bot nuitka
2. Create minimal python file main.py (The actual content does not matter as long as telegram is imported and used)

from telegram.ext import ApplicationBuilder

app = ApplicationBuilder()

3. Run main.py. Note that deprecation warning is not appearing (Which is correct behaviour)
4. Compile with nuitka by python -m nuitka --standalone main.py
5. Run the compiled program. Note that deprecation warning is appearing incorrectly, even though python-telegram-bot is installed instead of python-telegram-bot-raw

PTBUserWarning: Hey. You seem to be using the `python-telegram-bot-raw` library. Please note that this libray has been deprecated and will no longer be updated. Please instead use the `python-telegram-bot` library. The change requires no changes in your code and requires no additional dependencies. For additional information, please see the channel post at https://t.me/pythontelegrambotchannel/145

Expected behaviour

Deprecation warning should not appear when compiled with Nuitka

Actual behaviour

Deprecation warning appears when compiled with Nuitka even if python-telegram-bot is used instead of python-telegram-bot-raw

Operating System

Any (Recommend to test on Linux)

Version of Python, python-telegram-bot & dependencies

python-telegram-bot 21.3
Bot API 7.4
Python 3.11.5 (tags/v3.11.5:cce6ba9, Aug 24 2023, 14:38:34) [MSC v.1936 64 bit (AMD64)]

Relevant log output

No response

Additional Context

Related issue: #4261

Related PR: #4270

Related code:

This is happening because main.dist/telegram/ext is missing in the Nuitka compilation result.

Instead of checking by if not (Path(__file__).parent.resolve().absolute() / "ext").exists():, I propose using this check instead:

import importlib.utils

if importlib.util.find_spec("telegram.ext") is None:
    ...