chore: bump PHP to ^8.4 and illuminate/collections to ^10|^11|^12

Required for downstream consumers running on PHP 8.4. illuminate/collections
v8 emits "Implicitly marking parameter as nullable is deprecated" warnings
from its internal method signatures (e.g. filter(callable \$callback = null)).

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: cb-freddysart

composer.json

@@ -10,7 +10,7 @@
         }
     ],
     "require": {
-        "php": "^7.3 | ^8.0",
+        "php": "^8.4",
         "psr/http-message": "^1.0",
         "php-http/client-common": "^2.2",
         "php-http/httplug": "^2.2",
@@ -19,7 +19,7 @@
         "php-http/curl-client": "^2.2",
         "symfony/yaml": "^3.2|^4.3|^5.0",
         "nesbot/carbon": "^2.0",
-        "illuminate/collections": "^8.29.0",
+        "illuminate/collections": "^10.0 || ^11.0 || ^12.0",
         "guzzlehttp/psr7": "^1.7.0",
         "psr/cache": "^1.0",
         "league/flysystem-memory": "^1.0",