Remove softbuffer and raw_window_handle deps

Signed-off-by: Nico Burns <nico@nicoburns.com>

Author: nicoburns

Cargo.lock

@@ -16,8 +16,6 @@ debug_timer = { workspace = true }
 kurbo = { workspace = true }
 peniko = { workspace = true }
 tiny-skia = "0.11"
-softbuffer = "0.4"
-raw-window-handle = "0.6"
 swash = { workspace = true }
 
 # WindowRenderer backends