[MCOMPILER-519] Upgrade maven-invoker-plugin from 3.3.0 to 3.4.0

 * 3.4.0 brings in support for building on JDK 19

 * once the parent brings in this version, the explicit version can be
   of course removed

pom.xml

@@ -226,6 +226,8 @@ under the License.
             <plugin>
               <groupId>org.apache.maven.plugins</groupId>
               <artifactId>maven-invoker-plugin</artifactId>
+              <!-- TODO: verify the version override is still needed when upgrading parent -->
+              <version>3.4.0</version>
               <executions>
                 <execution>
                   <id>integration-test</id>