Avoid deprecations when using the masterminds/html5 HTML5 parser

Author: ste93cry

tests/End2End/End2EndTest.php

@@ -90,6 +90,10 @@ public function testGet404(): void
     {
         $client = static::createClient(['debug' => false]);
 
+        if (method_exists($client, 'useHtml5Parser')) {
+            $client->useHtml5Parser(false);
+        }
+
         try {
             $client->request('GET', '/missing-page');
 
@@ -113,6 +117,10 @@ public function testGetBadRequest(): void
     {
         $client = static::createClient(['debug' => false]);
 
+        if (method_exists($client, 'useHtml5Parser')) {
+            $client->useHtml5Parser(false);
+        }
+
         $client->request('GET', '/bad-request');
 
         $response = $client->getResponse();
@@ -127,6 +135,10 @@ public function testGet500(): void
     {
         $client = static::createClient();
 
+        if (method_exists($client, 'useHtml5Parser')) {
+            $client->useHtml5Parser(false);
+        }
+
         try {
             $client->request('GET', '/exception');