build(deps): Update icalendar requirement

Updates the requirements on [icalendar](https://github.com/collective/icalendar) to permit the latest version.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/main/CHANGES.rst)
- [Commits](collective/icalendar@v6.3.1...v7.0.2)

---
updated-dependencies:
- dependency-name: icalendar
  dependency-version: 7.0.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

pyproject.toml

@@ -37,7 +37,7 @@ dependencies = [
 
     # Utilities & Helpers
     "arrow>=1.3.0,<2.0.0",
-    "icalendar>=6.3.1,<7.0.0",
+    "icalendar>=6.3.1,<8.0.0",
     "django-common-helpers>=0.9.2,<1.0.0",
     "django-fullurl>=1.4,<2.0",
     "django-appconf>=1.1.0,<2.0.0",