sublime-music: unpin dependencies, fix build

I did a few things here:

- Removed the call to `xvfb-run`, it's no longer needed after upstream
  removed its ui tests: https://github.com/sublime-music/sublime-music/commit/bd573a0ed8faa246a35da6e16195826874e343fe
- Unpin `dataclasses-json`. This fixes
  https://github.com/NixOS/nixpkgs/issues/311270.
  It was pinned in
  https://github.com/nixos/nixpkgs/commit/8780d5eecff5645b763e9e8c5457ac7b05d75b3d
  with no explanation. When unpinning, I discovered that sublime-music's tests
  fail when run with the latest version of `dataclasses-music`. There's
  already an issue filed upstream about this:
  https://github.com/sublime-music/sublime-music/issues/439
  - To work around this, I switched to using `pytestCheckHook` and added
    `test_get_music_directory` to `disabledTests`.
- Unpin `semver`. It was pinned in
  https://github.com/nixos/nixpkgs/commit/ac848b1e6896957ba84177844be0f0b41d06ae5f
  with no explanation. This isn't necessary to fix the build, but it
  felt like good hygiene while I was in here (we shouldn't be
  pinning things without an explanation *why* they're pinned).

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