fix android build: upgrade gradle, AGP, and kotlin

Bump Gradle wrapper to 8.14.3, AGP to 8.11.1, and Kotlin to 2.2.20 to
meet the Flutter SDK's minimum supported versions.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

android/settings.gradle.kts

@@ -18,8 +18,8 @@ pluginManagement {
 
 plugins {
     id("dev.flutter.flutter-plugin-loader") version "1.0.0"
-    id("com.android.application") version "8.7.3" apply false
-    id("org.jetbrains.kotlin.android") version "2.1.0" apply false
+    id("com.android.application") version "8.11.1" apply false
+    id("org.jetbrains.kotlin.android") version "2.2.20" apply false
 }
 
 include(":app")