Bump kotlin-gradle-plugin from 1.3.30 to 1.3.50

Bumps kotlin-gradle-plugin from 1.3.30 to 1.3.50.

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:1.3.30'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.3.50'
         classpath "gradle.plugin.com.hierynomus.gradle.plugins:license-gradle-plugin:0.15.0"
     }
 }