[build] Update skins parents after xwiki-skins-9 release.
[build] Update skins parents after xwiki-skins-9 release.

git-svn-id: eea26612969e16cfeea121ea268596bb181b6a2a@14179 f329d543-caf0-0310-9063-dda96c69346f

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