Bump icalendar from 6.1.1 to 6.3.1 (#2647)

Bumps [icalendar](https://github.com/collective/icalendar) from 6.1.1 to 6.3.1.
- [Release notes](https://github.com/collective/icalendar/releases)
- [Changelog](https://github.com/collective/icalendar/blob/main/CHANGES.rst)
- [Commits](collective/icalendar@v6.1.1...v6.3.1)

---
updated-dependencies:
- dependency-name: icalendar
  dependency-version: 6.3.1
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

requirements.txt

@@ -4,7 +4,7 @@ filelock==3.18.0
 google-cloud-bigquery==3.33.0
 gspread==6.1.4
 humanize>=0.5.1
-icalendar==6.1.1
+icalendar==6.3.1
 Jinja2==3.1.6
 libmozdata==0.2.9
 numpy==2.2.4