Which HDMI cable for I2S?

I'm currently using an inexpensive 12 inch long Monoprice cable to connect my dac to a Gustard U18 interface. Honestly, it sounds quite good.

I don't want to buy a pricey cable, but maybe something by DH Labs, etc. 

There are some deals on older cables that meet HDMI 1.3, 1.4, or 2.0 standards. I know these standards are for video. Would all of them work for I2S digital audio? Would the higher standard HDMI 2.1 be better?