Update maven to 3.9.6 (#851)

Motivation:

We used an older version of maven

Modifications:

- Update to 3.9.6
- Use SHA512 to verify

Result:

Use latest maven release

.mvn/wrapper/maven-wrapper.properties

@@ -14,5 +14,5 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-distributionUrl=https://maven-central.storage-download.googleapis.com/maven2/org/apache/maven/apache-maven/3.9.5/apache-maven-3.9.5-bin.zip
-distributionSha256Sum=7822eb593d29558d8edf87845a2c47e36e2a89d17a84cd2390824633214ed423
+distributionUrl=https://maven-central.storage-download.googleapis.com/maven2/org/apache/maven/apache-maven/3.9.6/apache-maven-3.9.6-bin.zip
+distributionSha512Sum=0eb0432004a91ebf399314ad33e5aaffec3d3b29279f2f143b2f43ade26f4db7bd1c0f08e436e9445ac6dc4a564a2945d13072a160ae54a930e90581284d6461