wip: Lower PHP version requirement to >=8.3

Updated the PHP version requirement in composer.json from >=8.4 to >=8.3 to ensure broader compatibility. This change allows the library to be used in environments running PHP 8.3.

Author: efebagri

composer.json

@@ -25,7 +25,7 @@
         "source": "https://github.com/exbil/24fire-php-api"
     },
     "require": {
-        "php": ">=8.4",
+        "php": ">=8.3",
         "guzzlehttp/guzzle": "^7.9.2",
         "ext-json": "*"
     },