enable extensions

Signed-off-by: Sebastian Hoß <[email protected]>

pom.xml

@@ -221,6 +221,7 @@
           <groupId>org.sonatype.central</groupId>
           <artifactId>central-publishing-maven-plugin</artifactId>
           <version>${version.central-publishing-m-p}</version>
+          <extensions>true</extensions>
           <configuration>
             <publishingServerId>central</publishingServerId>
             <tokenEnabled>true</tokenEnabled>