Update Ktor 1.2.6

Author: q-litzler

buildSrc/src/main/kotlin/Ktor.kt

@@ -2,5 +2,5 @@ object Ktor : Dependency {
 
     override val group = "io.ktor"
     override val artifact = "ktor"
-    override val version = "1.2.5"
+    override val version = "1.2.6"
 }