Fix gradle deprecations

build.gradle

@@ -1,38 +1,16 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
-buildscript {
-    
-    repositories {
-        google()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:8.1.3'
-        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.10'
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
-    }
-}
-
 plugins {
+    id 'com.android.application' version '8.1.3' apply false
+    id 'org.jetbrains.kotlin.android' version '1.9.10' apply false
     id 'org.hidetake.swagger.generator' version '2.14.0'
 }
 
 ext {
     gotifyVersion = 'master'
-    specLocation = "$buildDir/gotify.spec.json"
-}
-
-allprojects {
-    repositories {
-        google()
-        mavenCentral()
-        maven { url "https://jitpack.io/" }
-    }
+    specLocation = "$layout.buildDirectory/gotify.spec.json"
 }
 
 tasks.register('clean', Delete) {
-    delete rootProject.buildDir
+    delete rootProject.layout.buildDirectory
 }
 
 static def download(String url, String filename ) {
@@ -49,7 +27,7 @@ static def download(String url, String filename ) {
 tasks.register('downloadSpec') {
     inputs.property 'version', gotifyVersion
     doFirst {
-        buildDir.mkdirs()
+        layout.buildDirectory.mkdirs()
         download("https://raw.githubusercontent.com/gotify/server/${gotifyVersion}/docs/spec.json", specLocation)
     }
 }