Replace classpath with plugins DSL

Replaced the old way of adding plugins to the classpath with plugins DSL: https://docs.gradle.org/current/userguide/plugins.html#sec:plugins_block.

build.gradle

@@ -1,18 +1,8 @@
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
+plugins {
-buildscript {
+    id 'com.android.application' apply false version '7.2.1'
-    repositories {
+    id 'org.jetbrains.kotlin.android' apply false version '1.7.0'
-        google()
-        mavenCentral()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:7.2.1'
-        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.7.0'
-
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
-    }
 }
 
 task clean(type: Delete) {
     delete rootProject.buildDir
-}
+}

settings.gradle

@@ -1,3 +1,11 @@
+pluginManagement {
+    repositories {
+        gradlePluginPortal()
+        google()
+        mavenCentral()
+    }
+}
+
 dependencyResolutionManagement {
     repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
     repositories {
@@ -5,5 +13,6 @@ dependencyResolutionManagement {
         mavenCentral()
     }
 }
+
 rootProject.name = "LibreTube"
 include ':app'