Remove filament/upgrade dev dependency

Delete the "filament/upgrade" entry from composer.json's require-dev. Also update the compiled CSS asset resources/dist/inspirecms.css (top-of-file/header changes) — likely a regenerated/minified stylesheet alongside the dependency cleanup.

Author: cklei-carly

composer.json

@@ -34,7 +34,6 @@
         "spatie/laravel-permission": "^6.0"
     },
     "require-dev": {
-        "filament/upgrade": "^4.0",
         "larastan/larastan": "^3.0",
         "laravel/pint": "^1.0",
         "nunomaduro/collision": "^8.0",