Merge pull request #618 from viartemev/renovate/kotlin-monorepo

fix(deps): update kotlin monorepo to v2.1.21

Author: viartemev

build.gradle

@@ -1,6 +1,6 @@
 buildscript {
     ext {
-        kotlin_version = "2.1.20"
+        kotlin_version = "2.1.21"
         rabbitmq_java_client_version = "5.25.0"
         junit_jupiter_version = "5.10.1"
         testcontainers_version = "1.21.0"