To test upscroll easier, and with all parts in conjunction.
`ManiaSkinnableTestScene`s already had the capability to switch
directions, but they did not show all parts together, which meant
regressions were missed.
- Update the GitHub Actions workflows to their latest versions.
- Replace the usage of the deprecated `set-output` command with the
new recommended way to set the output.
- Format the YAML files.
Reproduction steps:
1. Go to song select
2. Open beatmap listing
3. Import a beatmap that would fit the current filter criteria
4. The count of visible beatmaps does not change
Fixed by updating the count on `BeatmapSetsChanged` too.