deps(pip): update gunicorn requirement from <23,>=21.2 to >=21.2,<24

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@21.2.0...23.0.0)

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

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

Author: dependabot[bot]

requirements.txt

@@ -19,4 +19,4 @@ tenacity>=8.3,<9
 dill>=0.3.8,<0.5
 
 # Production server
-gunicorn>=21.2,<23
+gunicorn>=21.2,<24