Bump icalendar from 6.1.0 to 6.1.1

Bumps [icalendar](https://github.com/collective/icalendar) from 6.1.0 to 6.1.1.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/main/CHANGES.rst)
- [Commits](collective/icalendar@v6.1.0...v6.1.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -11,7 +11,7 @@ datadog==0.50.2
 twilio==9.4.3
 pyOpenSSL==25.0.0
 Pillow==11.1.0
-icalendar==6.1.0
+icalendar==6.1.1
 pytz==2024.2
 python-dateutil==2.9.0.post0
 psutil==6.1.1