Enable "core library deguaring" for android.

android/app/build.gradle.kts

@@ -16,6 +16,7 @@ android {
     ndkVersion = flutter.ndkVersion
 
     compileOptions {
+        isCoreLibraryDesugaringEnabled = true
         targetCompatibility = JavaVersion.VERSION_17
         sourceCompatibility = JavaVersion.VERSION_17
     }
@@ -36,6 +37,8 @@ android {
         targetSdk = flutter.targetSdkVersion
         versionCode = flutter.versionCode
         versionName = flutter.versionName
+
+        isMultiDexEnabled = true
     }
 
     buildTypes {
@@ -47,6 +50,10 @@ android {
     }
 }
 
+dependencies {
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
+}
+
 flutter {
     source = "../.."
 }