Update Kotlin

Signed-off-by: Graham <gpe@openrs2.org>

gradle/libs.versions.toml

@@ -6,7 +6,7 @@ guice = "5.1.0"
 jackson = "2.13.2"
 jimfs = "1.2"
 junit = "5.8.2"
-kotlin = "1.6.20"
+kotlin = "1.6.21"
 kotlinCoroutines = "1.6.1"
 ktor = "1.6.8"
 netty = "4.1.76.Final"

settings.gradle.kts

@@ -13,7 +13,7 @@ dependencyResolutionManagement {
 
 pluginManagement {
     plugins {
-        kotlin("jvm") version "1.6.20"
+        kotlin("jvm") version "1.6.21"
     }
 }