Upgrade to Maven Wrapper 3.9.0.

See #2779

Author: mp911de

Diff for: .mvn/wrapper/maven-wrapper.properties

@@ -1,2 +1,2 @@
-#Mon Jan 30 10:48:07 CET 2023
-distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
+#Mon Feb 20 11:58:05 CET 2023
+distributionUrl=https\://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.0/apache-maven-3.9.0-bin.zip