XWIKI-19188: Upgrade to css4j 3.7.2 / css4j-dom4j 3.7.1 / xml-dtd 4.0.0
XWIKI-19188: Upgrade to css4j 3.7.2 / css4j-dom4j 3.7.1 / xml-dtd 4.0.0

xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform,xwiki/xwiki-platform