Bump gunicorn from 21.2.0 to 22.0.0 in /ai-vision

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
...

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

ai-vision/requirements.txt

@@ -7,4 +7,4 @@ azure-cognitiveservices-vision-face==0.5.0
 opencv-python==4.8.0.74
 msrest==0.7.0
 requests==2.31.0
-gunicorn==21.2.0 
+gunicorn==22.0.0