JCR-4821: Update javadoc-plugin dependency to 3.4.0

git-svn-id: https://svn.apache.org/repos/asf/jackrabbit/trunk@1903156 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/jackrabbit-parent/pom.xml b/jackrabbit-parent/pom.xml
index 4b7280f..7f44286 100644
--- a/jackrabbit-parent/pom.xml
+++ b/jackrabbit-parent/pom.xml
@@ -323,7 +323,7 @@
         </plugin>
         <plugin>
           <artifactId>maven-javadoc-plugin</artifactId>
-          <version>3.2.0</version>
+          <version>3.4.0</version>
         </plugin>
         <plugin>
           <artifactId>maven-surefire-plugin</artifactId>