chore(samples): upgrade android gradle plugin and dependencies

sample_app/android/app/build.gradle

@@ -1,67 +1,34 @@
 plugins {
     id "com.android.application"
+    // START: FlutterFire Configuration
+    id "com.google.gms.google-services"
+    // END: FlutterFire Configuration
     id "kotlin-android"
+    // The Flutter Gradle Plugin must be applied after the Android and Kotlin Gradle plugins.
     id "dev.flutter.flutter-gradle-plugin"
 }
 
-def localProperties = new Properties()
-def localPropertiesFile = rootProject.file('local.properties')
-if (localPropertiesFile.exists()) {
-    localPropertiesFile.withReader('UTF-8') { reader ->
-        localProperties.load(reader)
-    }
-}
-
-
-def flutterVersionCode = localProperties.getProperty('flutter.versionCode')
-if (flutterVersionCode == null) {
-    flutterVersionCode = '1'
-}
-
-def flutterVersionName = localProperties.getProperty('flutter.versionName')
-if (flutterVersionName == null) {
-    flutterVersionName = '1.0'
-}
-
 android {
     namespace "io.getstream.chat.android.flutter.sample"
+    compileSdkVersion flutter.compileSdkVersion
+    ndkVersion "27.0.12077973"
 
-    compileSdkVersion 35
-
-    ndkVersion "26.2.11394342"
-
-    sourceSets {
-        main.java.srcDirs += 'src/main/kotlin'
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_11
+        targetCompatibility JavaVersion.VERSION_11
+        coreLibraryDesugaringEnabled true
     }
 
-    lintOptions {
-        disable 'InvalidPackage'
-        checkReleaseBuilds false
+    kotlinOptions {
+        jvmTarget = JavaVersion.VERSION_11.toString()
     }
 
     defaultConfig {
         applicationId "io.getstream.chat.android.flutter.sample"
-        minSdkVersion 23
-        targetSdkVersion 35
-        versionCode flutterVersionCode.toInteger()
-        versionName flutterVersionName
-        multiDexEnabled true
-    }
-
-    compileOptions {
-        // Flag to enable support for the new language APIs
-        coreLibraryDesugaringEnabled true
-    }
-
-    // Added this block:
-    afterEvaluate { project ->
-        if (project.hasProperty("kotlin")) {
-            project.tasks.withType(org.jetbrains.kotlin.gradle.tasks.KotlinCompile).all {
-                kotlinOptions {
-                    jvmTarget = "1.8"
-                }
-            }
-        }
+        minSdkVersion Math.max(flutter.minSdkVersion, 23)
+        targetSdkVersion flutter.targetSdkVersion
+        versionCode flutter.versionCode
+        versionName flutter.versionName
     }
 
     signingConfigs {
@@ -93,5 +60,5 @@ flutter {
 }
 
 dependencies {
-    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:1.2.2'
+    coreLibraryDesugaring 'com.android.tools:desugar_jdk_libs:2.0.4'
 }