chore(deps): update gunicorn requirement from ==20.0.* to ==22.0.*

Updates the requirements on [gunicorn](https://github.com/benoitc/gunicorn) to permit the latest version.
- [Release notes](https://github.com/benoitc/gunicorn/releases)
- [Commits](benoitc/gunicorn@20.0.0...22.0.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -1,4 +1,4 @@
 Flask==3.0.*
-gunicorn==20.0.*
+gunicorn==22.0.*
 markupsafe==2.0.1
 requests==2.28.*