Add Sha256sum to validate the maven binary (#2809)

To be able to validate the content of the downloaded binary with a given
sha256sum and to be sure that nothing is missing or it or not corrupted.

Author: bmscomp

.mvn/wrapper/maven-wrapper.properties

@@ -15,4 +15,5 @@
 # specific language governing permissions and limitations
 # under the License.
 distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.5/apache-maven-3.9.5-bin.zip
+distributionSha256Sum=7822eb593d29558d8edf87845a2c47e36e2a89d17a84cd2390824633214ed423
 wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar