Upgrade maven wrapper to 4.0.0-rc4

closes #4
0

Author: derTobsch

.mvn/wrapper/maven-wrapper.properties

@@ -16,4 +16,4 @@
 # under the License.
 wrapperVersion=3.3.2
 distributionType=only-script
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/4.0.0-rc-3/apache-maven-4.0.0-rc-3-bin.zip
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/4.0.0-rc-4/apache-maven-4.0.0-rc-4-bin.zip