Bump icalendar from 6.3.2 to 7.0.3

Bumps [icalendar](https://github.com/collective/icalendar) from 6.3.2 to 7.0.3.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/main/CHANGES.rst)
- [Commits](collective/icalendar@v6.3.2...v7.0.3)

---
updated-dependencies:
- dependency-name: icalendar
  dependency-version: 7.0.3
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
     "django-tables2==2.8.0",
     "django-taggit==6.1.0",
     "django-weasyprint==2.4.0",
-    "icalendar==6.3.2",
+    "icalendar==7.0.3",
     "irc3==1.1.10",
     "lxml==6.0.2",
     "nh3==0.3.2",