Update kotlin monorepo to v2 (major) (#20)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

pom.xml

@@ -13,7 +13,7 @@
 	<name>Jampuz Server</name>
 	<properties>
 		<java.version>21</java.version>
-		<kotlin.version>1.9.25</kotlin.version>
+		<kotlin.version>2.0.21</kotlin.version>
 	</properties>
 	<scm>
 		<connection>scm:git:https://github.com/jotajoti/jampuz-server</connection>