Bump icalendar from 5.0.7 to 5.0.8 (#2220)

Bumps [icalendar](https://github.com/collective/icalendar) from 5.0.7 to 5.0.8.
- [Changelog](https://github.com/collective/icalendar/blob/master/CHANGES.rst)
- [Commits](https://github.com/collective/icalendar/compare/v5.0.7...v5.0.8)

---
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==3.12.4
 gspread==5.11.1
 humanize>=0.5.1
-icalendar==5.0.7
+icalendar==5.0.8
 Jinja2==3.1.2
 libmozdata==0.2.4
 numpy==1.26.0