Allow PHP Spreadsheet version 5

Author: willemverspyck

composer.json

@@ -28,7 +28,7 @@
     "require-dev": {
         "escapestudios/symfony2-coding-standard": "^3",
         "friendsofphp/php-cs-fixer": "^3",
-        "phpoffice/phpspreadsheet": "^2|^3|^4",
+        "phpoffice/phpspreadsheet": "^2|^3|^4|^5",
         "phpunit/phpunit": "^11",
         "squizlabs/php_codesniffer": "^3"
     },