[5.6] Fixed league/flysystem-cached-adapter dependency (laravel#23817)

* Revert "Add missing dependency on league/flysystem-cached-adapter (laravel#23815)"

This reverts commit d60b1c1.

* Added to suggested deps

* Removed duplicate

* Sync with main composer.json

* Added to require-dev

composer.json

@@ -22,7 +22,6 @@
         "dragonmantank/cron-expression": "~2.0",
         "erusev/parsedown": "~1.7",
         "league/flysystem": "^1.0.8",
-        "league/flysystem-cached-adapter": "^1.0",
         "monolog/monolog": "~1.12",
         "nesbot/carbon": "^1.24.1",
         "psr/container": "~1.0",