bump minimum laravel version to 9

Author: arrilot

composer.json

@@ -12,13 +12,13 @@
     "homepage": "https://github.com/arrilot/laravel-widgets",
     "require": {
         "php": ">=7.4",
-        "illuminate/support": ">=8",
-        "illuminate/contracts": ">=8",
-        "illuminate/view": ">=8",
-        "illuminate/container": ">=8",
-        "illuminate/console": ">=8",
-        "illuminate/cache": ">=8",
-        "illuminate/routing": ">=8"
+        "illuminate/support": ">=9",
+        "illuminate/contracts": ">=9",
+        "illuminate/view": ">=9",
+        "illuminate/container": ">=9",
+        "illuminate/console": ">=9",
+        "illuminate/cache": ">=9",
+        "illuminate/routing": ">=9"
     },
     "require-dev": {
         "phpunit/phpunit": "~8.0",