Allow usage of newer "openspout/openspout"

Author: stloyd

src/adapter/etl-adapter-excel/src/Flow/ETL/Adapter/Excel/ExcelExtractor.php

@@ -137,6 +137,7 @@ private function createRowsFromCells(Row $row, int $previousRowDataCount = 0) :
         $rowData = \array_map(
             // Convert empty values to nullables if allowed
             fn (Cell $cell) => $this->convertEmptyToNull && '' === $cell->getValue() ? null : $cell->getValue(),
+            /** @phpstan-ignore-next-line method remove in 5.0 in favor of public property */
             method_exists($row, 'getCells') ? $row->getCells() : $row->cells
         );