updated android/build.gradle to Java 11.

android/build.gradle

@@ -42,8 +42,11 @@ android {
         // Flag to enable support for the new language APIs
         coreLibraryDesugaringEnabled true
         // Sets Java compatibility to Java 8
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
+    }
+    kotlinOptions {
+        jvmTarget = '11'
     }
 }