Upgrade to Maven Wrapper 3.9.6.

See #2800

Author: mp911de

.mvn/wrapper/maven-wrapper.properties

@@ -1,3 +1,3 @@
-#Wed Oct 04 18:22:43 PDT 2023
+#Thu Dec 14 08:37:40 CET 2023
 wrapperUrl=https\://repo.maven.apache.org/maven2/io/takari/maven-wrapper/0.5.6/maven-wrapper-0.5.6.jar
-distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.5/apache-maven-3.9.5-bin.zip
+distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.6/apache-maven-3.9.6-bin.zip