[skip ci] changing cmdstan version number back to original number
[skip ci] changing cmdstan version number back to original number

evelynmitchell/cmdstan,evelynmitchell/cmdstan,stan-dev/cmdstan,evelynmitchell/cmdstan,stan-dev/cmdstan,stan-dev/cmdstan,stan-dev/cmdstan,evelynmitchell/cmdstan