Use consistent versions of Maven for Maven wrapper and mvnd

To have the local build cache working, we need to use the same version
of Maven for CI and local builds, which would be 3.9.3.

mvnd has switched to Maven 4 in new versions so we will have to stick to
these versions for a while.

.mvn/wrapper/maven-wrapper.properties

@@ -14,6 +14,5 @@
 # KIND, either express or implied.  See the License for the
 # specific language governing permissions and limitations
 # under the License.
-distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.8/apache-maven-3.8.8-bin.zip
-distributionSha256Sum=2e181515ce8ae14b7a904c40bb4794831f5fd1d9641107a13b916af15af4001a
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.9.3/apache-maven-3.9.3-bin.zip
 wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.2.0/maven-wrapper-3.2.0.jar

.sdkmanrc

@@ -1,3 +1,4 @@
 # Enable auto-env through the sdkman_auto_env config
 # Add key=value pairs of SDKs to use below
 java=11.0.19-tem
+mvnd=1.0-m7-m39