Linker::link() and Linker::linkKnown() functions are deprecated as of MediaWiki 1.28, and the new LinkRenderer is preferred instead.
https://doc.wikimedia.org/mediawiki-core/master/php/classLinker.html
./SelectCategory/SelectCategory_body.php: $pageObj->$place .= Linker::link( $title, $catName )."\n";