Upgrade to Kotlin 2.1.21

Signed-off-by: Dmitry Sulman <[email protected]>

Author: dmitrysulman

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ jackson = "2.19.0"
 jreleaser = "1.18.0"
 junit = "5.12.2"
 kotest = "5.9.1"
-kotlin = "2.1.20"
+kotlin = "2.1.21"
 kotlinxCoroutines = "1.10.2"
 ktlintPlugin = "12.2.0"
 logbackAccess = "2.0.6"