Upgrade phpoffice/phpspreadsheet to newer version

Problem/Motivation

phpoffice/phpspreadsheet has released a new version (3.9.0) in January. (https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md#202...) Unfortunately, I am unable to upgrade it at the moment due to vbo_export requiring version ^2.2.

Could you please consider integrating the latest release?

Thank you!