Bump icalendar from 2.10.2 to 2.10.3

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]>

Gemfile.lock

@@ -217,8 +217,9 @@ GEM
     i18n-js (4.2.3)
       glob (>= 0.4.0)
       i18n
-    icalendar (2.10.2)
+    icalendar (2.10.3)
       ice_cube (~> 0.16)
+      ostruct
     ice_cube (0.17.0)
     image_processing (1.13.0)
       mini_magick (>= 4.9.5, < 5)
@@ -350,6 +351,7 @@ GEM
       validate_url
       webfinger (~> 2.0)
     orm_adapter (0.5.0)
+    ostruct (0.6.0)
     parallel (1.26.3)
     parser (3.3.5.0)
       ast (~> 2.4.1)