Bump gunicorn from 19.9.0 to 22.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 19.9.0 to 22.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@19.9.0...22.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-version: 22.0.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 requests==2.31.0
-gunicorn==19.9.0
+gunicorn==22.0.0
 lxml==4.9.2
 redis==3.5.3
 APScheduler==3.10.0;python_version>="3.10"