Port to D10?

I sent a merge request to make the form D10 compliant. The code sent also contains patch #9 of #3256578, I had to insert patch #3256578 #9 as the code I sent would not work on Drupal 10.
The rest should go smoothly.

Added D10 compatibility in Composer.json.

When using the work from https://git.drupalcode.org/project/php-ffmpeg/-/merge_requests/4 I ran into errors and noticed some refactored functions were missing return statements, so I made https://git.drupalcode.org/project/php-ffmpeg/-/merge_requests/5 and it seems to work well enough to get by now. It feels weird to make a new merge request since this is building off of an existing merge request, but this seemed to be the best option to get the fix accessible to grab as a patch for now.

Committed D10 changes as part of 🐛 Incompatible with newest version of the php-ffmpeg (v0.19.0) package, Drupal 10 compatibility Fixed , as far as I could see there was nothing here that was needed on top of the generated patch in 📌 Automated Drupal 10 compatibility fixes Needs review .