Upgrade Maven used by mvnw to 3.9.12

* Upgrade Maven from 3.9.11 to 3.9.12
  Release notes: https://maven.apache.org/docs/3.9.12/release-notes.html

Signed-off-by: Holger Friedrich <mail@holger-friedrich.de>

Author: holgerfriedrich

.mvn/wrapper/maven-wrapper.properties

@@ -16,5 +16,5 @@
 # under the License.
 wrapperVersion=3.3.2
 distributionType=only-script
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.11/apache-maven-3.9.11-bin.zip
-distributionSha256Sum=0d7125e8c91097b36edb990ea5934e6c68b4440eef4ea96510a0f6815e7eeadb
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.12/apache-maven-3.9.12-bin.zip
+distributionSha256Sum=305773a68d6ddfd413df58c82b3f8050e89778e777f3a745c8e5b8cbea4018ef