build(android): bump Java to 25 and targetSdk to 37

Raise sourceCompatibility/targetCompatibility to Java 25 and Kotlin jvmTarget to JVM_25 across app and subprojects, and CI java-version to 25 (Kotlin 2.3.21 supports JVM_25). Bump targetSdk to 37 to match compileSdk. Building locally requires Flutter to use JDK 25 (flutter config --jdk-dir).

android/app/build.gradle.kts

@@ -26,13 +26,13 @@ android {
 
     compileOptions {
         isCoreLibraryDesugaringEnabled = true
-        sourceCompatibility = JavaVersion.VERSION_17
-        targetCompatibility = JavaVersion.VERSION_17
+        sourceCompatibility = JavaVersion.VERSION_25
+        targetCompatibility = JavaVersion.VERSION_25
     }
 
     kotlin {
         compilerOptions {
-            jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_17)
+            jvmTarget.set(org.jetbrains.kotlin.gradle.dsl.JvmTarget.JVM_25)
         }
     }
 
@@ -50,7 +50,7 @@ android {
     defaultConfig {
         applicationId = "com.zarz.spotiflac"
         minSdk = flutter.minSdkVersion
-        targetSdk = 36
+        targetSdk = 37
         versionCode = flutter.versionCode
         versionName = flutter.versionName
         multiDexEnabled = true