Merge branch '5.4' into 6.0

* 5.4:
  Leverage array_is_list
  drop dev dependency on the HttpClient component

Author: derrabus

Dumper/XmlDumper.php

@@ -263,7 +263,7 @@ private function addServices(\DOMElement $parent)
 
     private function convertParameters(array $parameters, string $type, \DOMElement $parent, string $keyAttribute = 'key')
     {
-        $withKeys = array_keys($parameters) !== range(0, \count($parameters) - 1);
+        $withKeys = !array_is_list($parameters);
         foreach ($parameters as $key => $value) {
             $element = $this->document->createElement($type);
             if ($withKeys) {

composer.json

@@ -19,6 +19,7 @@
         "php": ">=8.0.2",
         "psr/container": "^1.1|^2.0",
         "symfony/deprecation-contracts": "^2.1|^3.0",
+        "symfony/polyfill-php81": "^1.22",
         "symfony/service-contracts": "^1.1.6|^2.0|^3.0"
     },
     "require-dev": {