Update to phpunit9

phpstan.neon

@@ -8,6 +8,6 @@ parameters:
         - src
         - tests
     bootstrapFiles:
-        - vendor/bin/.phpunit/phpunit-8-0/vendor/autoload.php
+        - vendor/bin/.phpunit/phpunit-9-0/vendor/autoload.php
     excludes_analyse:
         - tests/bootstrap.php
\ No newline at end of file

phpunit.xml.dist

 <?xml version="1.0" encoding="UTF-8"?>
-
 <!-- https://phpunit.de/manual/current/en/appendixes.configuration.html -->
-<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:noNamespaceSchemaLocation="http://schema.phpunit.de/6.5/phpunit.xsd"
-         backupGlobals="false"
-         colors="true"
-         bootstrap="tests/bootstrap.php"
->
+<phpunit xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/9.3/phpunit.xsd" backupGlobals="false" colors="true" bootstrap="tests/bootstrap.php">
+  <coverage>
+    <include>
+      <directory>src</directory>
+      <directory>tests</directory>
+    </include>
+  </coverage>
   <php>
     <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="8" />
+    <server name="SYMFONY_PHPUNIT_VERSION" value="9"/>
   </php>
-
   <testsuites>
     <testsuite name="Project Test Suite">
       <directory>tests</directory>
     </testsuite>
   </testsuites>
-
-    <filter>
-        <whitelist>
-            <directory>src</directory>
-            <directory>tests</directory>
-        </whitelist>
-    </filter>
-
   <listeners>
     <listener class="Symfony\Bridge\PhpUnit\SymfonyTestsListener"/>
   </listeners>