Don't refernce workspace Kotlin version for external project opens

AppLovin MAX Demo App - Kotlin/app/build.gradle

@@ -22,7 +22,7 @@ android {
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlinVersion"
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:1.3.10"
     implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
     implementation 'androidx.appcompat:appcompat:1.1.0'
     implementation 'com.google.android.material:material:1.1.0'