Downgrade Maven Version

Tycho does not support Maven 3.9.0

Author: jeffgbutler

eclipse/.mvn/wrapper/maven-wrapper.properties

@@ -14,5 +14,7 @@
 # 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/3.9.0/apache-maven-3.9.0-bin.zip
+#
+# DO NOT Update to Maven 3.9.0 - it is not supported by Tycho 3.0.2
+distributionUrl=https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.8.7/apache-maven-3.8.7-bin.zip
 wrapperUrl=https://repo.maven.apache.org/maven2/org/apache/maven/wrapper/maven-wrapper/3.1.1/maven-wrapper-3.1.1.jar