Bump icalendar from 4.0.9 to 4.1.0
Bump icalendar from 4.0.9 to 4.1.0

Bumps [icalendar](https://github.com/collective/icalendar) from 4.0.9 to 4.1.0.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/4.1.0/CHANGES.rst)
- [Commits](https://github.com/collective/icalendar/compare/4.0.9...4.1.0)

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

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
wger-project/wger,wger-project/wger,wger-project/wger,wger-project/wger