Upgrade Kotlin to 2.1.0 and enable jvm.target.validation warning mode

.gitlab-ci.yml

@@ -10,6 +10,8 @@ build_android_apk:
   stage: build
   before_script:
     - flutter doctor -v
+    - mkdir -p /root/.gradle
+    - echo "kotlin.jvm.target.validation.mode=warning" >> /root/.gradle/gradle.properties
   script:
     - cd mobile
     - flutter pub get

mobile/android/gradle.properties

@@ -1,3 +1,4 @@
 org.gradle.jvmargs=-Xmx4G -XX:MaxMetaspaceSize=2G -XX:+HeapDumpOnOutOfMemoryError
 android.useAndroidX=true
 android.enableJetifier=true
+kotlin.jvm.target.validation.mode=warning

mobile/android/settings.gradle

@@ -19,7 +19,7 @@ pluginManagement {
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
     id "com.android.application" version "8.6.0" apply false
-    id "org.jetbrains.kotlin.android" version "1.9.24" apply false
+    id "org.jetbrains.kotlin.android" version "2.1.0" apply false
 }
 
 include ":app"