update mini

Author: CarGuo

android/app/build.gradle

@@ -31,7 +31,7 @@ android {
     defaultConfig {
         // TODO: Specify your own unique Application ID (https://developer.android.com/studio/build/application-id.html).
         applicationId "com.shuyu.gsygithub.gsygithubappflutter"
-        minSdkVersion 21
+        minSdkVersion flutter.minSdkVersion
         targetSdkVersion 33
         versionCode 63
         versionName "7.6.0"