Remove explicit jvmTarget specification

Author: Paul Rybitskyi

build.gradle

@@ -157,12 +157,4 @@ subprojects {
     }
 
     sourceCompatibility = 1.8
-
-    compileKotlin {
-        kotlinOptions.jvmTarget = "1.8"
-    }
-
-    compileTestKotlin {
-        kotlinOptions.jvmTarget = "1.8"
-    }
 }