Not working with Python 3.12

Description:

When launching the daemon the following error is thrown:

Traceback (most recent call last):
  File "/usr/bin/mailnag", line 43, in <module>
    from Mailnag.daemon.mailnagdaemon import MailnagDaemon
  File "/usr/lib/python3.12/site-packages/Mailnag/daemon/mailnagdaemon.py", line 26, in <module>
    from Mailnag.daemon.mailchecker import MailChecker
  File "/usr/lib/python3.12/site-packages/Mailnag/daemon/mailchecker.py", line 26, in <module>
    from Mailnag.common.plugins import HookTypes
  File "/usr/lib/python3.12/site-packages/Mailnag/common/plugins.py", line 20, in <module>
    import imp
ModuleNotFoundError: No module named 'imp'

Additional info:

• Package version: 2.2.0-7
• Upstream bug report: https://github.com/pulb/mailnag/issues/244
• Fix: https://github.com/pulb/mailnag/pull/232

Steps to reproduce:

1. Launch mailnag from a terminal