Update Kotlin core dependencies to v2

renovate[bot] · web-flow · commit c3e0b853682b · 2025-09-10T08:59:32.000Z
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
@@ -1,5 +1,5 @@
 [versions]
-kotlin = "1.9.23"
+kotlin = "2.2.20"
 kotlin-wrappers = "1.0.0-pre.715"
 kotlin-serialization = "1.6.3"
 spring-boot = "3.2.3"
