HTTP API: Revert changeset [52244].

Reverting Requests 2.0.0 changes and moving to WordPress 6.0 cycle. Why? The namespace and file case renaming revealed 2 issues in Core's upgrader process.

See https://core.trac.wordpress.org/ticket/54504#comment:22 for more information.

Follow-up to [52327].

See #54562, #54504.
Built from https://develop.svn.wordpress.org/trunk@52328


git-svn-id: http://core.svn.wordpress.org/trunk@51920 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/Requests/Exception/HTTP/429.php

@@ -0,0 +1,29 @@
+<?php
+/**
+ * Exception for 429 Too Many Requests responses
+ *
+ * @see https://tools.ietf.org/html/draft-nottingham-http-new-status-04
+ * @package Requests
+ */
+
+/**
+ * Exception for 429 Too Many Requests responses
+ *
+ * @see https://tools.ietf.org/html/draft-nottingham-http-new-status-04
+ * @package Requests
+ */
+class Requests_Exception_HTTP_429 extends Requests_Exception_HTTP {
+	/**
+	 * HTTP status code
+	 *
+	 * @var integer
+	 */
+	protected $code = 429;
+
+	/**
+	 * Reason phrase
+	 *
+	 * @var string
+	 */
+	protected $reason = 'Too Many Requests';
+}