android, upgraded all components to the latest versions and it builds successfully!!

android/app/build.gradle.kts

@@ -1,15 +1,15 @@
+import org.jetbrains.kotlin.gradle.dsl.JvmTarget
+
 plugins {
     id("com.android.application")
 
-    // This will need removed in Gradle/AGP 9.
+    // This supposedly needs removed in Gradle/AGP 9 but works fine.
     id("org.jetbrains.kotlin.android") // id("kotlin-android")
 
     // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id("dev.flutter.flutter-gradle-plugin")
 }
 
-import org.jetbrains.kotlin.gradle.dsl.JvmTarget
-
 android {
     namespace = "com.hyperling.sunset_alarm"
     compileSdk = flutter.compileSdkVersion
@@ -21,7 +21,7 @@ android {
         sourceCompatibility = JavaVersion.VERSION_17
     }
 
-    // This will need removed in Gradle/AGP 9.
+    // This supposedly needs removed in Gradle/AGP 9, but then uses 21 and fails to build.
     kotlin {
         compilerOptions {
             jvmTarget.set(JvmTarget.JVM_17)
@@ -49,7 +49,7 @@ android {
 }
 
 dependencies {
-    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.4")
+    coreLibraryDesugaring("com.android.tools:desugar_jdk_libs:2.1.5")
 }
 
 flutter {