Bump icalendar from 2.10.2 to 2.10.3 (#4603)

Bumps [icalendar](https://github.com/icalendar/icalendar) from 2.10.2 to 2.10.3.
- [Changelog](https://github.com/icalendar/icalendar/blob/main/CHANGELOG.md)
- [Commits](icalendar/icalendar@v2.10.2...v2.10.3)

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

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

Gemfile.lock

@@ -375,8 +375,9 @@ GEM
       domain_name (~> 0.5)
     i18n (1.14.6)
       concurrent-ruby (~> 1.0)
-    icalendar (2.10.2)
+    icalendar (2.10.3)
       ice_cube (~> 0.16)
+      ostruct
     ice_cube (0.17.0)
     ice_nine (0.11.2)
     image_processing (1.13.0)