android: Upgrade java version to 11

src/android/app/build.gradle

@@ -16,8 +16,8 @@ android {
     ndkVersion "25.2.9519653"
 
     compileOptions {
-        sourceCompatibility JavaVersion.VERSION_1_8
-        targetCompatibility JavaVersion.VERSION_1_8
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
     }
 
     lint {