Update intelliJPlatform Gradle plugin to 2.9.0

Author: jreznot

gradle/libs.versions.toml

@@ -5,8 +5,8 @@ opentest4j = "1.3.0"
 
 # plugins
 changelog = "2.4.0"
-intelliJPlatform = "2.7.2"
-kotlin = "2.2.0"
+intelliJPlatform = "2.9.0"
+kotlin = "2.1.20"
 kover = "0.9.1"
 qodana = "2025.1.1"