chore(deps): update gunicorn requirement from <24,>=20 to >=23.0.0,<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@20.0.0...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/adapter.txt

@@ -27,5 +27,5 @@ starlette>=0.19.1,<0.45; python_version<"3.9"
 starlette>=0.49.3,<1; python_version>="3.9"
 tornado>=6,<7
 uvicorn<1                                # The oldest version can vary among Python runtime versions
-gunicorn>=20,<24
+gunicorn>=23.0.0,<24
 websocket_client>=1.2.3,<2               # Socket Mode 3rd party implementation