Update kombu requirement from ==5.4.* to ==5.5.* (#4951)

Updates the requirements on [kombu](https://github.com/celery/kombu) to permit the latest version.
- [Release notes](https://github.com/celery/kombu/releases)
- [Changelog](https://github.com/celery/kombu/blob/main/Changelog.rst)
- [Commits](https://github.com/celery/kombu/compare/v5.4.0rc1...v5.5.1)

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

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pyproject.toml

@@ -61,7 +61,7 @@ dependencies = [
   "importlib_metadata==8.*",  # Polyfill, we can probably drop this once we require Python 3.10+
   "isoweek",
   "jsonschema",
-  "kombu==5.4.*",
+  "kombu==5.5.*",
   "libsass==0.23.*",
   "lxml",
   "markdown==3.7",  # 3.3.5 requires importlib-metadata>=4.4, but django-bootstrap3 requires importlib-metadata<3.