Require phpunit directly instead of through the symfony bridge

So the testing dependencies are pinned as well.

composer.json

@@ -32,6 +32,7 @@
         "friendsofphp/php-cs-fixer": "^3.0",
         "phpstan/phpstan": "^1.0.0",
         "phpstan/phpstan-phpunit": "^1.0.0",
+        "phpunit/phpunit": "^9",
         "symfony/browser-kit": "^5.3",
         "symfony/http-client": "^5.3",
         "symfony/phpunit-bridge": "^5.3",
@@ -70,14 +71,12 @@
         "post-install-cmd": "cghooks add --ignore-lock",
         "post-update-cmd": "cghooks update",
         "test": [
-            "@php vendor/bin/simple-phpunit"
+            "@php vendor/bin/phpunit"
         ],
         "phpstan": [
-            "@php vendor/bin/simple-phpunit --atleast-version 0",
             "@php vendor/bin/phpstan analyze --ansi"
         ],
         "psalm": [
-            "@php vendor/bin/simple-phpunit --atleast-version 0",
             "@php vendor/bin/psalm"
         ],
         "lint": [
@@ -92,7 +91,7 @@
             "@php vendor/bin/php-cs-fixer --ansi fix --dry-run --diff"
         ],
         "coverage": [
-            "@php -dxdebug.mode=coverage vendor/bin/simple-phpunit --coverage-html _coverage"
+            "@php -dxdebug.mode=coverage vendor/bin/phpunit --coverage-html _coverage"
         ]
     }
 }

phpstan.neon

@@ -7,8 +7,6 @@ parameters:
     paths:
         - src
         - tests
-    bootstrapFiles:
-        - vendor/bin/.phpunit/phpunit-9-0/vendor/autoload.php
     excludePaths:
         - tests/bootstrap.php
         - src/Swagger/DocumentationNormalizer.php

phpunit.xml.dist

@@ -11,8 +11,6 @@
     <ini name="error_reporting" value="-1"/>
     <server name="APP_ENV" value="test" force="true"/>
     <server name="SHELL_VERBOSITY" value="-1"/>
-    <server name="SYMFONY_PHPUNIT_REMOVE" value=""/>
-    <server name="SYMFONY_PHPUNIT_VERSION" value="9"/>
     <server name="SYMFONY_DEPRECATIONS_HELPER" value='max[direct]=0&amp;quiet[]=indirect'/>
     <server name="KERNEL_CLASS" value="Dbp\Relay\CoreBundle\Tests\Kernel"/>
   </php>