Upgrade dependencies, android sdk, flutter, gradle, etc

flutter/android/.gitignore

@@ -11,3 +11,7 @@ GeneratedPluginRegistrant.java
 key.properties
 **/*.keystore
 **/*.jks
+
+build/
+
+app/.cxx/

flutter/android/app/build.gradle

@@ -34,7 +34,7 @@ if (keystorePropertiesFile.exists()) {
 android {
     namespace "com.blackforestbytes.simplecloudnotifier"
     compileSdkVersion flutter.compileSdkVersion
-    ndkVersion flutter.ndkVersion
+    ndkVersion        "27.0.12077973"                // should be `flutter.ndkVersion` - but some plugins need 27, even though flutter still has the default value of 26 (flutter 3.29 | 2025-04-12)
 
     compileOptions {
         coreLibraryDesugaringEnabled true

flutter/android/build.gradle

@@ -1,16 +1,3 @@
-buildscript {
-    ext.kotlin_version = '1.7.10'
-    repositories {
-        google()
-        mavenCentral()
-    }
-
-    dependencies {
-        classpath 'com.android.tools.build:gradle:7.3.1'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
-    }
-}
-
 allprojects {
     repositories {
         google()

flutter/android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-7.6.1-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.11.1-bin.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists

flutter/android/settings.gradle

@@ -23,7 +23,8 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "com.android.application" version "7.3.0" apply false
+    id "com.android.application" version "8.9.1" apply false
+    id "org.jetbrains.kotlin.android" version "2.1.10" apply false
     // START: FlutterFire Configuration
     id "com.google.gms.google-services" version "4.3.15" apply false
     // END: FlutterFire Configuration