pkg_resources/setuptools deprecation

[yajrendrag]

Environment (please complete the following information):

• Ubuntu Linux 24.04
• python version 3.12.3
• subsync version 0.4.26

Describe the bug
using ffsubsync in unmanic 0.4.0 fails (prior to 0.4 upgrade, it worked fine) - see Output secton for Traceback

To Reproduce
pip install ffsubsync in unmanic 0.4 docker environment and try to run ffsubsync on a file.

Expected behavior
ffsubsync should run normally - see additional context below

Output

Traceback (most recent call last):
  File "/opt/venv/bin/ffs", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/ffsubsync/ffsubsync.py", line 719, in main
    return run(parser)["retval"]
           ^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/ffsubsync/ffsubsync.py", line 501, in run
    sync_was_successful = _run_impl(args, result)
                          ^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/ffsubsync/ffsubsync.py", line 437, in _run_impl
    reference_pipe.fit(args.reference)
  File "/opt/venv/lib/python3.12/site-packages/ffsubsync/sklearn_shim.py", line 255, in fit
    self._final_estimator.fit(Xt, y, **fit_params)
  File "/opt/venv/lib/python3.12/site-packages/ffsubsync/speech_transformers.py", line 333, in fit
    detector = _make_webrtcvad_detector(
               ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/venv/lib/python3.12/site-packages/ffsubsync/speech_transformers.py", line 136, in _make_webrtcvad_detector
    import webrtcvad
  File "/opt/venv/lib/python3.12/site-packages/webrtcvad.py", line 1, in <module>
    import pkg_resources
ModuleNotFoundError: No module named 'pkg_resources'

Test case
[Optional] You can bundle additional debugging information into a tar archive as follows:

subsync vid.mkv -i in.srt -o out.srt --make-test-case

This will create a file vid.mkv.$timestamp.tar.gz or similar a few KiB in size; you can attach it by clicking the "attach files" button below.

Additional context
I patched my install to modify webrtcvad.py to remove the import pkg_resources line and set the webrtcvad version to the installed version as shown by pip instead of trying to read it from pkg_resources.

My question is whether you intend to make ffsubsync compatible with importlib instead of / in addition to setuptools? If not, it'd help to know that... unmanic can possibly lock it's container to an older setuptools.