Bump kombu from 5.3.7 to 5.6.0

Bumps [kombu](https://github.com/celery/kombu) from 5.3.7 to 5.6.0.
- [Release notes](https://github.com/celery/kombu/releases)
- [Changelog](https://github.com/celery/kombu/blob/main/Changelog.rst)
- [Commits](celery/kombu@v5.3.7...v5.6.0)

---
updated-dependencies:
- dependency-name: kombu
  dependency-version: 5.6.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -11,7 +11,7 @@ djangorestframework==3.15.1
 google-api-python-client==2.187.0
 gunicorn==22.0.0
 h2==4.1.0
-kombu==5.3.7
+kombu==5.6.0
 lameenc==1.7.0
 nnabla==1.30.0
 numba==0.56.4