Code update from PHP 7.4 to PHP 8.1 - PhpSpreadsheet

We may need to update to PhpSpreadsheet v1.20.0 for PHP 8.1

https://php.libhunt.com/phpspreadsheet-latest-version

composer.json

{
    "require": {
        "jasig/phpcas": "1.3.8",
        "dompdf/dompdf": "^0.8.6",
        "phpoffice/phpexcel": "^1.8",
        "phpoffice/phpspreadsheet": "^1.14"
    }
}

change composer.json to

{
    "require": {
        "jasig/phpcas": "1.3.8",
        "dompdf/dompdf": "^0.8.6",
        "phpoffice/phpexcel": "^1.8",
        "phpoffice/phpspreadsheet": "^1.20"
    }
}

sudo composer update phpoffice/phpspreadsheet