Switch Javadoc into legacy mode

Author: ppkarwasz

pom.xml

@@ -668,6 +668,7 @@
               <!-- `notimestamp` avoids `diff` noise and is required for reproducible builds: https://maven.apache.org/guides/mini/guide-reproducible-builds.html -->
               <notimestamp>true</notimestamp>
               <skip>${maven.javadoc.skip}</skip>
+              <legacyMode>true</legacyMode>
               <bottom><![CDATA[<p align="center">
               Copyright &copy; {inceptionYear}-{currentYear} {organizationName}.
               All Rights Reserved.<br/>