build(deps): bump icalendar from 6.3.2 to 7.0.0

Bumps [icalendar](https://github.com/collective/icalendar) from 6.3.2 to 7.0.0.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/main/CHANGES.rst)
- [Commits](https://github.com/collective/icalendar/compare/v6.3.2...v7.0.0)

---
updated-dependencies:
- dependency-name: icalendar
  dependency-version: 7.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

requirements.txt

@@ -17,7 +17,7 @@ django-select2==8.4.8
 django-simple-history==3.11.0
 django-widget-tweaks==1.5.1
 gunicorn==25.0.1
-icalendar==6.3.2
+icalendar==7.0.0
 Pillow==12.1.0
 psycopg[binary,pool]==3.3.2
 python-decouple==3.8