Bump gunicorn from 20.1.0 to 23.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 20.1.0 to 23.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.1.0...23.0.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -9,7 +9,7 @@ werkzeug==2.2.3
 Pygments==2.11.2
 cssmin==0.2.0
 PyYAML==6.0
-gunicorn==20.1.0
+gunicorn==23.0.0
 pangu==4.0.6.1
 redis==4.4.4
 aiosmtplib==1.1.6