Upgrade to Maven Wrapper 3.8.4.

See #2099

Author: mp911de

.mvn/wrapper/maven-wrapper.properties

@@ -1,3 +1,3 @@
-#Fri Sep 10 15:39:43 CEST 2021
+#Tue Feb 22 13:55:13 CET 2022
 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/3.8.2/apache-maven-3.8.2-bin.zip
+distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.4/apache-maven-3.8.4-bin.zip