build(deps): Bump icalendar from 5.0.13 to 6.0.0 (#1429)

Bumps [icalendar](https://github.com/collective/icalendar) from 5.0.13 to 6.0.0.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/main/CHANGES.rst)
- [Commits](collective/icalendar@v5.0.13...v6.0.0)

---
updated-dependencies:
- dependency-name: icalendar
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

pyproject.toml

@@ -76,7 +76,7 @@ django-stdimage = "^6.0.2"
 django-storages = "^1.14"
 factory-boy = "^3.3.1"
 gunicorn = "^23.0.0"
-icalendar = "^5.0.12"
+icalendar = "^6.0.0"
 invoke = "^2.2.0"
 json-logging-py = "^0.2"
 mock = "^5.1.0"