Optimize dependencies handling

build.gradle

@@ -1,9 +1,9 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    // Ref: https://kotlinlang.org/releases.html
-    ext.kotlin_version = '1.5.30'
-    ext.kotlin_coroutines_version = "1.5.1"
+
+    apply from: 'dependencies.gradle'
+
     repositories {
         google()
         jcenter()
@@ -11,12 +11,13 @@ buildscript {
             url "https://plugins.gradle.org/m2/"
         }
     }
+
     dependencies {
         // Release notes of Android Gradle Plugin (AGP):
         // https://developer.android.com/studio/releases/gradle-plugin
-        classpath 'com.android.tools.build:gradle:7.0.2'
+        classpath libs.gradle.gradlePlugin
+        classpath libs.gradle.kotlinPlugin
         classpath 'com.google.gms:google-services:4.3.10'
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
         classpath 'org.sonarsource.scanner.gradle:sonarqube-gradle-plugin:3.3'
         classpath 'com.google.android.gms:oss-licenses-plugin:0.10.4'
         classpath "com.likethesalad.android:string-reference:1.2.2"