Bump icalendar from 5.0.11 to 5.0.12 (#2368)

Bumps [icalendar](https://github.com/collective/icalendar) from 5.0.11 to 5.0.12.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/master/CHANGES.rst)
- [Commits](collective/icalendar@v5.0.11...v5.0.12)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -3,7 +3,7 @@ argparse==1.4.0
 filelock==3.13.1
 gspread==6.0.0
 humanize>=0.5.1
-icalendar==5.0.11
+icalendar==5.0.12
 Jinja2==3.1.3
 libmozdata==0.2.4
 numpy==1.26.3