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
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -1,7 +1,7 @@
 flasgger==0.9.7.1
 Flask==3.0.2
 Flask_MonitoringDashboard==3.3.0
-gunicorn==21.2.0
+gunicorn==22.0.0
 Markdown==3.5.2
 pymongo==4.6.2
 python-dotenv==1.0.1