Fix `LoadRaw` return value not marked as nullable
Fix `LoadRaw` return value not marked as nullable

ZLima12/osu-framework,smoogipooo/osu-framework,ZLima12/osu-framework,ppy/osu-framework,ppy/osu-framework,peppy/osu-framework,peppy/osu-framework,peppy/osu-framework,smoogipooo/osu-framework,ppy/osu-framework