Merge branch '6.4' into 7.1

* 6.4:
  [Console] Fix division by 0 error
  [ErrorHandler] Fix error message with PHP 8.5
  Add an experimental CI job for PHP 8.5
  [HttpClient] Always set CURLOPT_CUSTOMREQUEST to the correct HTTP method in CurlHttpClient
  evaluate access flags for properties with asymmetric visibility
  [Mime] Fix wrong PHPDoc in `FormDataPart` constructor

HttpClient/Test/Fixtures/web/index.php

@@ -42,6 +42,7 @@ switch (parse_url($vars['REQUEST_URI'], \PHP_URL_PATH)) {
         exit;
 
     case '/head':
+        header('X-Request-Vars: '.json_encode($vars, \JSON_UNESCAPED_SLASHES | \JSON_UNESCAPED_UNICODE));
         header('Content-Length: '.strlen($json), true);
         break;