Allow newer PHPUnit
MODIFY
composer.json
composer.json
"require-dev": {
"symfony/process": "^4.4 || ^5.0",
- "phpunit/phpunit": "^8.5",
+ "phpunit/phpunit": "^8.5 || ^9.0",
"herrera-io/box": "~1.6.1",
"container-interop/container-interop": "^1.2"
},

Allow newer PHPUnit