Bump gunicorn from 20.1.0 to 22.0.0 in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [gunicorn](https://github.com/benoitc/gunicorn).


Updates `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
  dependency-group: pip
...

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

requirements.txt

@@ -1,3 +1,3 @@
 Flask==2.3.2
 Werkzeug==2.3.8
-gunicorn==20.1.0
+gunicorn==22.0.0