Remove redundant kotlin version from Versions.kt

Is now set by the radar-commons kotlin project gradle plugin

Author: pvannierop

buildSrc/src/main/kotlin/Versions.kt

@@ -3,7 +3,6 @@ object Versions {
     const val project = "2.3.3-SNAPSHOT"
 
     const val java = 17
-    const val kotlin = "1.9.22"
     const val dockerCompose = "0.17.5"
 
     const val radarCommons = "1.1.3"