[5.3] Switch voku/portable-utf8 to joomla-backport for php8.4 bc #44489
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Fixes many PHP 8.4 deprecation warnings see https://ci.joomla.org/HLeithner/joomla-cms/627/1/17
In case upstream voku/portable-utf8 merges voku/portable-utf8#208 and creates a release we should switch back to upstream and remove our backport.