refactor: do not use future-deprecated DATE_RFC7231 constant (#9657)

Author: paulbalandan

system/Cookie/CookieInterface.php

@@ -57,7 +57,7 @@ interface CookieInterface
      * @see https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Date
      * @see https://tools.ietf.org/html/rfc7231#section-7.1.1.2
      */
-    public const EXPIRES_FORMAT = DATE_RFC7231;
+    public const EXPIRES_FORMAT = 'D, d M Y H:i:s T';
 
     /**
      * Returns a unique identifier for the cookie consisting

user_guide_src/source/changelogs/v4.7.0.rst

@@ -99,7 +99,7 @@ Message Changes
 Changes
 *******
 
-- **Cookie:** The ``CookieInterface::EXPIRES_FORMAT`` has been changed to ``D, d M Y H:i:s \G\M\T`` to follow the recommended format in RFC 7231.
+- **Cookie:** The ``CookieInterface::EXPIRES_FORMAT`` has been changed to ``D, d M Y H:i:s T`` to follow the recommended format in RFC 7231.
 - **Format:** Added support for configuring ``json_encode()`` maximum depth via ``Config\Format::$jsonEncodeDepth``.
 - **Paths:** Added support for changing the location of the ``.env`` file via the ``Paths::$envDirectory`` property.