build(deps): Bump phpoffice/phpspreadsheet from 1.30.4 to 1.30.6

Bumps [phpoffice/phpspreadsheet](https://github.com/PHPOffice/PhpSpreadsheet) from 1.30.4 to 1.30.6.
- [Release notes](https://github.com/PHPOffice/PhpSpreadsheet/releases)
- [Changelog](https://github.com/PHPOffice/PhpSpreadsheet/blob/1.30.6/CHANGELOG.md)
- [Commits](PHPOffice/PhpSpreadsheet@1.30.4...1.30.6)

---
updated-dependencies:
- dependency-name: phpoffice/phpspreadsheet
  dependency-version: 1.30.6
  dependency-type: direct:production
...

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

Author: dependabot[bot]