Merge branch 'PHP-8.0' into PHP-8.1

* PHP-8.0:
  $context parameter of get_headers() is nullable

Author: cmb69

ext/standard/basic_functions.stub.php

@@ -1860,7 +1860,7 @@ function rawurlencode(string $string): string {}
 function rawurldecode(string $string): string {}
 
 /**
- * @param resource $context
+ * @param resource|null $context
  * @return array<int|string, string|array>|false
  * @refcount 1
  */

ext/standard/basic_functions_arginfo.h

@@ -1,5 +1,5 @@
 /* This is a generated file, edit the .stub.php file instead.
- * Stub hash: 96393b26861733e5c7fc9a12095a29c07ed73928 */
+ * Stub hash: 87ed2b04b9b46ce3df78d6f9d6d62bd6b2ae8fe5 */
 
 ZEND_BEGIN_ARG_WITH_RETURN_TYPE_INFO_EX(arginfo_set_time_limit, 0, 1, _IS_BOOL, 0)
 	ZEND_ARG_TYPE_INFO(0, seconds, IS_LONG, 0)