[ImgBot] Optimize images (#4056)
[ImgBot] Optimize images (#4056)

/examples/assets/spine/spineboy-pro.png -- 736.59kb -> 726.36kb (1.39%)

Signed-off-by: ImgBotApp <858471a511451575f9769176c7c5b94525007a21@gmail.com>

Co-authored-by: ImgBotApp <858471a511451575f9769176c7c5b94525007a21@gmail.com>
playcanvas/engine,MicroWorldwide/PlayCanvas,playcanvas/engine,MicroWorldwide/PlayCanvas