Update kotlin to v2.4.21

Reviewed-on: #1

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ sqlite = "3.53.2.0"
 mariadb = "3.5.9"
 androidx-lifecycle = "2.10.0"
 compose-multiplatform = "1.11.1"
-kotlin = "2.4.10"
+kotlin = "2.4.21"
 kotlinx-coroutines = "1.11.0"
 ktor = "3.5.1"
 spring-sec = "7.1.0"

renovate.json

@@ -0,0 +1,3 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json"
+}