Update Java API links

Author: melissalinkert

ant/java.xml

@@ -293,7 +293,7 @@ your FindBugs installation's lib directory. E.g.:
       <classpath refid="runtime.classpath"/>
       <doctitle><![CDATA[<h1>Bio-Formats</h1>]]></doctitle>
       <bottom><![CDATA[${copyright.begin} ${YEAR} ${copyright.end}]]></bottom>
-      <link href="http://docs.oracle.com/javase/8/docs/api/"/>
+      <link href="http://docs.oracle.com/javase/11/docs/api/"/>
       <link href="https://imagej.net/developer/api/"
             offline="true" packagelistLoc="${root.dir}/ant/package-list"/>
     </javadoc>

components/bundles/bioformats_package/build.xml

@@ -41,7 +41,7 @@ Type "ant -p" for a list of targets.
       <classpath refid="runtime.classpath"/>
       <doctitle><![CDATA[<h1>Bio-Formats</h1>]]></doctitle>
       <bottom><![CDATA[${copyright.begin} ${YEAR} ${copyright.end}]]></bottom>
-      <link href="http://docs.oracle.com/javase/8/docs/api/"/>
+      <link href="http://docs.oracle.com/javase/11/docs/api/"/>
       <link href="https://imagej.net/developer/api/"
             offline="true" packagelistLoc="${root.dir}/ant/package-list"/>
     </javadoc>

pom.xml

@@ -279,7 +279,7 @@
             <use>false</use>
             <links>
               <!-- Java 8 -->
-              <link>http://docs.oracle.com/javase/8/docs/api/</link>
+              <link>http://docs.oracle.com/javase/11/docs/api/</link>
 
               <!-- ImageJ1 -->
               <link>http://jenkins.imagej.net/job/ImageJ1-javadoc/javadoc/</link>