Switch to using Symfony's PHPUnit Bridge

Author: colinodell

composer.json

@@ -37,11 +37,12 @@
         "squizlabs/php_codesniffer": "^3.4.0"
     },
     "require-dev": {
-        "phpunit/phpunit": "^7.5 || ^8.5 || ^9.3"
+        "symfony/phpunit-bridge": "^5.1"
     },
     "scripts": {
         "test": [
             "@phpcs",
+            "./vendor/bin/simple-phpunit",
             "make test"
         ],
         "phpcs": "./vendor/bin/phpcs"