Bump phpoffice/phpspreadsheet from 2.3.8 to 4.3.1

Bumps [phpoffice/phpspreadsheet](https://github.com/PHPOffice/PhpSpreadsheet) from 2.3.8 to 4.3.1.
- [Release notes](https://github.com/PHPOffice/PhpSpreadsheet/releases)
- [Changelog](https://github.com/PHPOffice/PhpSpreadsheet/blob/master/CHANGELOG.md)
- [Commits](PHPOffice/PhpSpreadsheet@2.3.8...4.3.1)

---
updated-dependencies:
- dependency-name: phpoffice/phpspreadsheet
  dependency-version: 4.3.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

composer.json

@@ -68,7 +68,7 @@
         "mezzio/mezzio-helpers": "^5.16",
         "mezzio/mezzio-laminasviewrenderer": "^2.15",
         "mezzio/mezzio-session-ext": "^1.19",
-        "phpoffice/phpspreadsheet": "^2.1"
+        "phpoffice/phpspreadsheet": "^4.3"
     },
     "require-dev": {
         "friendsofphp/php-cs-fixer": "@stable",