- I was going through the `sorbet/files.yaml` moving various things to
`true`, playing around locally, and happened upon some files that it
was tracking that had been deleted.
- We want to do some automation of new files, but I'm not sure we'd ever
considered the possibility of code being removed. :-D
- This adds a `--prune-files-list` switch and updates the Tapioca GitHub
Actions workflow to use it. Any changes to the `sorbet/files.yaml`
file will be committed as part of the scheduled Tapioca update job.