Prevent type mismatch exception thrown in Gradle 7 (#1396)

Author: fractalwrench

packages/platform-android/native_modules.gradle

@@ -128,7 +128,7 @@ class ReactNativeModules {
    * @param generatedFileContentsTemplate
    */
   void generatePackagesFile(File outputDir, String generatedFileName, String generatedFileContentsTemplate) {
-    ArrayList<HashMap<String, String>>[] packages = this.reactNativeModules
+    ArrayList<HashMap<String, String>> packages = this.reactNativeModules
     String packageName = this.packageName
 
     String packageImports = ""