Remove unnecessary custom PHPUnit bootstrap to load phpstan preload

Author: samsonasik

phpunit.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
          xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.6/phpunit.xsd"
-         bootstrap="tests/bootstrap.php"
+         bootstrap="vendor/autoload.php"
          cacheResultFile=".phpunit.cache/test-results"
          executionOrder="depends,defects"
          forceCoversAnnotation="true"