Quick fix for ffmpeg-the-third dependency issue

[Woonters]

By switching the dependency to point at the git-repo we can use the latest version of the package (which isn't 7 months behind) fixing a compile bug. This only requires 1 edit in the actual code which switches to getting a mutable version of the parameters
this closes #19

[Woonters]

Alternatively if you want to avoid pointing at the git-repo for stability issues. Enable the feature "non-exhaustive-enums" in the features for "ffmpeg-the-third" implemented in this branch on my fork https://github.com/Woonters/grav1synth_versioning_fix/tree/compile_error

[shssoichiro]

Rather than point to the git repo, I went ahead and published a new version (3.0.0+ffmpeg-7.1.0) for ffmpeg-the-third. Could you try pointing this repo to the newly published version? Thanks.

[Woonters]

I've done that, I will add that I had a short convo with the ffmpeg the third dev who said the main repo will be updated at some point they are just waiting on finalizing some major breaking changes