build(deps): bump saade/filament-fullcalendar (#468)

Bumps [saade/filament-fullcalendar](https://github.com/saade/filament-fullcalendar) from 4.0.0-beta3 to 4.0.0-beta4.
- [Release notes](https://github.com/saade/filament-fullcalendar/releases)
- [Changelog](https://github.com/saade/filament-fullcalendar/blob/4.x/CHANGELOG.md)
- [Commits](saade/filament-fullcalendar@v4.0.0-beta3...v4.0.0-beta4)

---
updated-dependencies:
- dependency-name: saade/filament-fullcalendar
  dependency-version: 4.0.0-beta4
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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