Bump gunicorn from 21.2.0 to 23.0.0

Bumps [gunicorn](https://github.com/benoitc/gunicorn) from 21.2.0 to 23.0.0.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@21.2.0...23.0.0)

---
updated-dependencies:
- dependency-name: gunicorn
  dependency-version: 23.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

requirements.txt

@@ -2,7 +2,7 @@ Flask==2.3.2
 Flask-SQLAlchemy==3.0.5
 Flask-Login==0.6.2
 Werkzeug==2.3.6
-gunicorn==21.2.0
+gunicorn==23.0.0
 pyotp==2.9.0
 qrcode==8.2
 pillow==10.0.0