build(deps): bump mastodon-py from 2.1.4 to 2.2.1

Bumps [mastodon-py](https://github.com/halcy/Mastodon.py) from 2.1.4 to 2.2.1.
- [Release notes](https://github.com/halcy/Mastodon.py/releases)
- [Changelog](https://github.com/halcy/Mastodon.py/blob/master/CHANGELOG.rst)
- [Commits](https://github.com/halcy/Mastodon.py/compare/v2.1.4...v2.2.1)

---
updated-dependencies:
- dependency-name: mastodon-py
  dependency-version: 2.2.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -22,7 +22,7 @@ libloader @ git+https://github.com/accessibleapps/libloader@bc94811c095b2e57a036
 libretranslatepy==2.1.4
 lief==0.15.1
 Markdown==3.10.2
-Mastodon.py==2.1.4
+Mastodon.py==2.2.1
 numpy==2.4.4
 oauthlib==3.3.1
 packaging==25.0