Bump gunicorn from 21.2.0 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 21.2.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@21.2.0...22.0.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -19,7 +19,7 @@ Flask-Security-Too==5.3.3
 Flask-SQLAlchemy==3.0.5
 Flask-WTF==1.1.2
 greenlet==3.0.3
-gunicorn==21.2.0
+gunicorn==22.0.0
 idna==3.7
 importlib_resources==6.4.0
 itsdangerous==2.1.2