WP_Feed_Cache::create() should be declared static

[fabifott]

The factory function WP_Feed_Cache::create() is not declared static.

It should be:

        public static function create($location, $filename, $extension) {
                return new WP_Feed_Cache_Transient($location, $filename, $extension);
        }

[jeremyfelt]

Hi @fabifott, thanks for opening a ticket. This issue is being tracked as part of #29204.