Fix php notice for php8.1+ about DateTime::setDate return type #131
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I'm using PHP 8.1.2 and PHP 8.1.7 versions with your great library.
I found a small issue:
Deprecated function: Return type of Seboettg\CiteProc\Rendering\Date\DateTime::setDate($year, $month, $day) should either be compatible with DateTime::setDate(int $year, int $month, int $day): DateTime, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in include() (line 480 of /var/www/vendor/composer/ClassLoader.php).
To fix it and have compatibility with older PHP versions we just need to add 1 line to your overridden setDate function.