GH-142 - Upgrade to Kotlin 1.9.25.

Author: odrotbohm

Diff for: pom.xml

@@ -22,7 +22,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<assertj.version>3.26.3</assertj.version>
 		<junit.version>5.11.2</junit.version>
-		<kotlin.version>1.8.22</kotlin.version>
+		<kotlin.version>1.9.25</kotlin.version>
 	</properties>
 
 	<licenses>