bug: fix build on android

Author: juliansteenbakker

flutter_secure_storage/android/build.gradle

@@ -8,7 +8,7 @@ buildscript {
     }
 
     dependencies {
-        classpath 'com.android.tools.build:gradle:8.1.2'
+        classpath 'com.android.tools.build:gradle:8.3.2'
     }
 }
 
@@ -44,5 +44,5 @@ android {
 }
 
 dependencies {
-    implementation "androidx.security:security-crypto:1.1.0"
+    implementation "androidx.security:security-crypto:1.1.0-alpha06"
 }

flutter_secure_storage/android/src/main/java/com/it_nomads/fluttersecurestorage/FlutterSecureStoragePlugin.java

@@ -9,6 +9,8 @@
 import androidx.annotation.NonNull;
 
 import java.io.FileNotFoundException;
+import java.io.PrintWriter;
+import java.io.StringWriter;
 import java.util.HashMap;
 import java.util.Map;