Update celery requirement from <5.0.0,>=4.3.0 to >=4.3.0,<6.0.0

Updates the requirements on [celery](https://github.com/celery/celery) to permit the latest version.
- [Release notes](https://github.com/celery/celery/releases)
- [Changelog](https://github.com/celery/celery/blob/v5.2.6/Changelog.rst)
- [Commits](celery/celery@v4.3.0...v5.2.6)

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

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

setup.py

@@ -91,7 +91,7 @@ def get_version(version_file):
         # Celery 5.0 introduces breaking changes to the CLI. See
         # https://docs.celeryq.dev/en/stable/history/whatsnew-5.0.html?highlight=command%20line%20options#new-command-line-interface
         # for more information.
-        "celery >= 4.3.0,<5.0.0",
+        "celery >= 4.3.0,< 6.0.0",
         "cryptography >= 2.4.2",
         "defusedxml",
         "dnspython",