Bump icalendar from 5.0.10 to 5.0.11 in /src/requirements

Bumps [icalendar](https://github.com/collective/icalendar) from 5.0.10 to 5.0.11.
- [Changelog](https://github.com/collective/icalendar/blob/master/CHANGES.rst)
- [Commits](collective/icalendar@v5.0.10...v5.0.11)

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

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

src/requirements/production.txt

@@ -22,7 +22,7 @@ django-taggit==4.0.0
 django-wkhtmltopdf==3.4.0
 future==0.18.3
 html5lib==1.1
-icalendar==5.0.10
+icalendar==5.0.11
 ipython==8.16.0
 irc3==1.1.10
 lxml==4.9.3