Update project to use Gradle's plugins{} block

Summary:
This project was still using the legacy Gradle's "apply:" syntax
to apply Gradle Plugins. I'm changing it here to use instead the
`plugins{}` block as it make easier to apply other plugins for publishing later.

Reviewed By: mdvacca

Differential Revision: D46330014

fbshipit-source-id: 5483a717a62d5ab76749026c5203dc96a35d73e7

build.gradle

@@ -5,18 +5,9 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-// Top-level build file where you can add configuration options common to all sub-projects/modules.
-
-buildscript {
-    repositories {
-        google()
-        mavenCentral()
-    }
-    dependencies {
-        classpath 'com.android.tools.build:gradle:8.0.1'
-        // NOTE: Do not place your application dependencies here; they belong
-        // in the individual module build.gradle files
-    }
+plugins {
+    id("com.android.library") version "8.0.1" apply false
+    id("com.android.application") version "8.0.1" apply false
 }
 
 allprojects {