Bump unisharp/laravel-filemanager from 2.6.4 to 2.9.1

Bumps [unisharp/laravel-filemanager](https://github.com/UniSharp/laravel-filemanager) from 2.6.4 to 2.9.1.
- [Release notes](https://github.com/UniSharp/laravel-filemanager/releases)
- [Commits](UniSharp/laravel-filemanager@v2.6.4...v2.9.1)

---
updated-dependencies:
- dependency-name: unisharp/laravel-filemanager
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>