Fixed stub for pygame._sdl2.video.Texture.__init__

[COUR4G3]

Added the depth argument between size and static as per the Cython function definition.

Very small contribution but I ran into an error where I passed my value for static as a positional argument instead of a keyword-argument and debugged it to find that an argument was missing from the stubs.

For reference, passing True to the depth argument results in an error similar to the following:

  ...
    self._texture = SDL2Texture(display.renderer, surface.size, static, streaming)
  File "video.pyx", line 226, in pygame._sdl2.video.Texture.__init__
  File "video.pyx", line 224, in pygame._sdl2.video.Texture.__init__
  File "video.pyx", line 165, in pygame._sdl2.video.format_from_depth
ValueError: no standard masks exist for given bitdepth with alpha

[damusss]

I checked, and the argument does exist in the source but not in the stubs. LGTM, Thanks for contributing! 🎉

[ankith26]

LGTM, nice catch! Thanks for contributing 👍