fix: update require versions

Author: leeqvip

composer.json

@@ -3,17 +3,21 @@
     "description": "An authorization library that supports access control models like ACL, RBAC, ABAC in Hyperf.",
     "license": "Apache-2.0",
     "authors": [
+        {
+            "name": "TechLee",
+            "email": "[email protected]"
+        },
         {
             "name": "yikang",
             "email": "[email protected]"
         }
     ],
     "require": {
-        "php": "^7.2",
+        "php": ">=7.2",
         "ext-swoole": ">=4.5",
         "hyperf/db-connection": "^2.0",
         "hyperf/config": "~2.0.0",
-        "casbin/casbin": "^2.2"
+        "casbin/casbin": "~3.21"
     },
     "autoload": {
         "psr-4": {
@@ -30,4 +34,4 @@
             "config": "Hyperf\\Permission\\ConfigProvider"
         }
     }
-}
+}