adjust rdf4j javadocs

Author: acoburn

pom.xml

@@ -205,7 +205,7 @@
               <link>https://jena.apache.org/documentation/javadoc/jena/</link>
               <link>https://jena.apache.org/documentation/javadoc/arq/</link>
               <link>https://www.antlr.org/api/Java/</link>
-              <link>https://rdf4j.org/javadoc/5.1.0/</link>
+              <link>https://rdf4j.org/javadoc/latest/</link>
             </links>
             <header>
               <![CDATA[