gradle, update versions for Kotlin, AGP, and Gradle.

android/settings.gradle.kts

@@ -19,11 +19,11 @@ pluginManagement {
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
 
-    id("com.android.application") version "9.4.1" apply false
+    id("com.android.application") version "9.5.0" apply false
 
     // This must exist to satisfy Flutter's Gradle plugin validation for AGP 9 bundled Kotlin:
     // "Error: Your project's Kotlin version (2.2.10) is lower than Flutter's minimum supported version of 2.2.20."
-    id("org.jetbrains.kotlin.android") version "2.4.20" apply false
+    id("org.jetbrains.kotlin.android") version "2.4.21" apply false
 }
 
 include(":app")