Bump highlight version to 10.4.0
<show>private</show>
<footer><![CDATA[
<link rel="stylesheet" href="./assertj-javadoc.css"">
- <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/9.15.10/highlight.min.js"></script>
+ <script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/10.4.0/highlight.min.js"></script>
<script type="text/javascript">hljs.initHighlightingOnLoad();</script>
]]></footer>
</configuration>
