ci: update generated copier template from example

Author: github-actions[bot]

{{app_name}}/pom.xml.jinja

@@ -102,7 +102,7 @@
     </dependency>
     <dependency>
       <groupId>org.jetbrains.kotlin</groupId>
-      <artifactId>kotlin-test-junit</artifactId>
+      <artifactId>kotlin-test-junit5</artifactId>
       <scope>test</scope>
     </dependency>
     <!-- Project Reactor -->