Bump kotlin-gradle-plugin from 1.3.50 to 1.3.60

Bumps [kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 1.3.50 to 1.3.60.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

build.gradle

@@ -10,7 +10,7 @@ buildscript {
 
     dependencies {
         //noinspection DifferentKotlinGradleVersion
-        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.60'
         classpath "gradle.plugin.com.hierynomus.gradle.plugins:license-gradle-plugin:0.15.0"
     }
 }