Downgrade version of kotlin (#45)

Author: mohamead

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ junit = "4.13.2"
 # plugins
 changelog = "2.2.1"
 intelliJPlatform = "2.6.0"
-kotlin = "2.2.0"
+kotlin = "2.1.21"
 kover = "0.9.1"
 qodana = "2025.1.1"