Update Kotlin version to 2.1.20

Author: andreas-eberle

hibernate-orm-panache-kotlin-quickstart/pom.xml

@@ -13,7 +13,7 @@
         <quarkus.platform.version>999-SNAPSHOT</quarkus.platform.version>
         <surefire-plugin.version>3.1.2</surefire-plugin.version>
         <compiler-plugin.version>3.11.0</compiler-plugin.version>
-        <kotlin.version>2.1.0</kotlin.version>
+        <kotlin.version>2.1.20</kotlin.version>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>