Update dependency phpunit/phpunit to v11 (#41)

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Frank Dekker <fdekker@123inkt.nl>

Author: renovate[bot]

composer.json

@@ -50,7 +50,7 @@
         "phpstan/phpstan-phpunit": "^1.3",
         "phpstan/phpstan-strict-rules": "^1.5",
         "phpstan/phpstan-symfony": "^1.3",
-        "phpunit/phpunit": "^10.5.6",
+        "phpunit/phpunit": "^10.5 || ^11.0",
         "roave/security-advisories": "dev-latest",
         "squizlabs/php_codesniffer": "^3.6",
         "symfony/browser-kit": "^6.0||^7.0",

phpunit.xml.dist

@@ -1,6 +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/10.1/phpunit.xsd"
+         xsi:noNamespaceSchemaLocation="https://schema.phpunit.de/10.5/phpunit.xsd"
+         bootstrap="tests/bootstrap.php"
          requireCoverageMetadata="true"
          failOnRisky="true"
          failOnWarning="true"

tests/bootstrap.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+use Symfony\Component\ErrorHandler\ErrorHandler;
+use Symfony\Component\Filesystem\Filesystem;
+
+// cleanup kernel cache
+(new Filesystem())->remove(__DIR__ . '/.kernel');
+
+// PHPUnit 11 keeps track of which error handler are added and removed. Until this is fixed, we need to register the error handler
+// before PHPUnit registration.
+ErrorHandler::register(null, false);