[BUG] With ptb_sqlalchemy_jobstore exeception when rescheduling jobs

[Giulianini]

Module this issue is about

Please state which module you're reporting a bug for: ptb_sqlalchemy_jobstore

Steps to reproduce

1. Use job_queue scheduler with PTBSQLAlchemyJobStore as jobostore

2. Reschedule a Job

Expected behaviour

Can reschedule a job

Actual behaviour

When trying to modify a job (it's deserialized and processed by jobstore.py) I come through this exeception

  File "/Users/luca/Desktop/memo-telegram-bot/src/scheduler/jobstore.py", line 88, in _prepare_job
    tg_job = Job._from_aps_job(job)  # pylint: disable=W0212
  File "/Users/luca/.virtualenvs/memo-telegram-bot/lib/python3.10/site-packages/telegram/ext/_jobqueue.py", line 810, in _from_aps_job
    return job.func.__self__
AttributeError: 'function' object has no attribute '__self__'

Configuration

Operating System:

Version of Python, python-telegram-bot & dependencies:

$ python -m telegram

python-telegram-bot 20.2
Bot API 6.6
Python 3.10.1 (main, Apr 2 2022, 16:59:14) [Clang 13.0.0 (clang-1300.0.29.30)]

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