message: Update GIF of `game_of_life` example
diff: @@ -6,8 +6,8 @@ on top of a `Canvas` widget and other controls.
  The __[`main`]__ file contains the relevant code of the example.
  <div align="center">
  - <a href="https://gfycat.com/regalspiritedjaguarundi">
  - <img src="https://thumbs.gfycat.com/RegalSpiritedJaguarundi-size_restricted.gif">
  + <a href="https://gfycat.com/briefaccurateaardvark">
  + <img src="https://thumbs.gfycat.com/BriefAccurateAardvark-size_restricted.gif">
  </a>
  </div>
  