Merge pull request #39 from lcobucci/dependabot/composer/phpunit/phpu…

…nit-tw-9.0

Update phpunit/phpunit requirement from ^8.5 to ^9.0

composer.json

@@ -35,7 +35,7 @@
         "phpstan/phpstan-deprecation-rules": "^0.11",
         "phpstan/phpstan-phpunit": "^0.11",
         "phpstan/phpstan-strict-rules": "^0.11",
-        "phpunit/phpunit": "^8.5",
+        "phpunit/phpunit": "^9.0",
         "squizlabs/php_codesniffer": "^3.5",
         "twig/twig": "^2.12",
         "zendframework/zend-diactoros": "^2.2"