Update sdl2 dependency in gfk_window_sdl
Update sdl2 dependency in gfk_window_sdl

gfx-rs/gfx-rs,ColinKinloch/gfx,ColinKinloch/gfx,JohnColanduoni/gfx,tanderegg/gfx,Bastacyclop/gfx,sectopod/gfx-rs,davll/gfx,JohnColanduoni/gfx,tanderegg/gfx