[MBUILDCACHE-39] Upgrade to maven-parent pom 39

Author: gnodet

pom.xml

@@ -25,7 +25,7 @@ under the License.
  <parent>
  <groupId>org.apache.maven.extensions</groupId>
  <artifactId>maven-extensions</artifactId>
- <version>37</version>
+ <version>39</version>
  <relativePath />
  </parent>