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Why this change is needed?
PhpSpreadsheet/Writer/Pdf.php Class defines a protected static mixed array called $paperSizes, this array contains string values along with array values. 'strtoupper() expects parameter 1 to be string, array given' error happens due to array passed to $paperSize variable from that $paperSizes mixed array on the Mpdf Class where Pdf extends
Examples of cases, when a 'Letter' paper size is chosen, then no problem occurs since the index in the array is a string value, but when 'Tabloid' paper size is chosen the value in the index for that paper size is an array, that's when the strtoupper() error happens.