Bump gunicorn from 20.1.0 to 22.0.0 in /lib/filesharing

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.1.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.1.0...22.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-type: direct:production
...

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

lib/filesharing/requirements.txt

@@ -2,7 +2,7 @@ APScheduler==3.10.1
 asgiref==3.7.2
 click==8.1.3
 Django==4.2.11
-gunicorn==20.1.0
+gunicorn==22.0.0
 pytz==2023.3
 six==1.16.0
 sqlparse==0.4.4