Update to 15.2 latest final

Author: karesti

pom.xml

@@ -2,7 +2,7 @@
     <parent>
         <groupId>org.infinispan</groupId>
         <artifactId>infinispan-build-configuration-parent</artifactId>
-        <version>15.2.1.Final</version>
+        <version>15.2.6.Final</version>
     </parent>
     <modelVersion>4.0.0</modelVersion>
     <groupId>org.infinispan.tutorial.simple</groupId>