Fix hash_hkdf() on PHP 8.1 (#678)

Author: cedric-anne

generated/8.1/functionsList.php

@@ -16,6 +16,7 @@
     'date', // this function throws an error instead of returning false PHP 8.0, but the doc has only been updated since PHP 8.4
     'getallheaders', // always return an array since PHP 7, see https://github.com/php/doc-en/commit/68e52ef14de33f6752a8fdda1ae83c861c5babdb
     'gmp_random_seed', // this function throws an error instead of returning false since PHP 8.0
+    'hash_hkdf', // this function throws an error instead of returning false since PHP 8.0
     'long2ip', // false return type cannot actually be returned, see https://github.com/php/php-src/pull/13395
     'pack', // this function no longer returns false since PHP 8.0, but the doc has only been updated since PHP 8.4
     'imagesx', // this function throws an error instead of returning false PHP 8.0, see https://github.com/php/doc-en/commit/0462f49fb00dd5abaec3aa322009f2eb40a3279d