[FIXED JENKINS-11318] Wagon 2.0 upgrade broke the Redeploy task for webdav repositories

upgrade embeder version which doesn't have more deps on wagon http ligth

maven-plugin/pom.xml

@@ -310,7 +310,7 @@ THE SOFTWARE.
     <dependency>
       <groupId>org.jenkins-ci.lib</groupId>
       <artifactId>lib-jenkins-maven-embedder</artifactId>
-      <version>3.8</version>
+      <version>3.9</version>
       <exclusions>
         <exclusion><!-- we'll add our own patched version. see https://issues.jenkins-ci.org/browse/JENKINS-1680 -->
           <groupId>jtidy</groupId>