补充composer.json文件中扩展要求

composer.json

@@ -20,15 +20,20 @@
         }
     ],
     "require": {
-        "php": ">=7.2.0",
+        "php": ">=7.4.0",
         "ext-gd": "*",
         "ext-curl": "*",
         "ext-bcmath": "*",
         "ext-json": "*",
         "ext-pdo": "*",
         "ext-openssl": "*",
+        "ext-mbstring": "*",
         "ext-libxml": "*",
         "ext-simplexml": "*",
+        "ext-zlib": "*",
+        "ext-zip": "*",
+        "ext-redis": "*",
+        "ext-fileinfo": "*",
         "topthink/framework": "^6.0.0",
         "topthink/think-orm": "^2.0",
         "topthink/think-multi-app": "^1.0",