Conflicts:
- `app/models/status.rb`:
Upstream refactored `visibility` handling to a concern, while glitch-soc had
custom code adjacent to some of the changed lines.
Applied upstream's changes.
- `lib/mastodon/version.rb`:
Upstream moved some definitions to `config/mastodon.yml`, while glitch-soc's
default github repository had been modified.
Applied upstream's changes and updated `config/mastodon.yml` accordingly.
