Support for Python 3.14 (GIL-free threading)

[peircej]

Would be great if ffpyplayer could provide wheels for Python 3.14

3.14 brings free-threading (no GIL) to Python by default (whereas in Python 3.13 it relies on the user fetching the correct interpreter/installer) Suffice to say free threading is very useful, especially to apps that use video rendering (e.g. prepare the video while updating the GUI in another thread) so this is a particularly useful update

[peircej]

@matham @cclauss @misl6 am I correct in thinking that ffpyplayer is no longer being maintained? I totally understand that supporting open source projects is hard and under-resourced, but we're trying to gauge whether we need to move our dependency elsewhere (e.g. to PyAV)

[cclauss]

I am not a maintainer of this repo, so I am not able to answer.