If you bought the game on Steam, there is a way to downgrade by grabbing the depot files from the version you're looking for.

Downgrading legitimately-purchased Steam copy of GTAV

This post refers to downgrading to 3095, but if you want to downgrade to 3179 instead, just use manifest ID3235923229384003759. In case it isn't clear the manifest ID is that long number at the end of the console command.

If you did not purchase on Steam and did not back up your game files before the June 25 update, you are screwed as far as legal methods which can be discussed here on Github are concerned.