The cables aren't versioned. They're just rated in categories for attenuation exactly like copper phone wiring is and named for the connector type just like USB

The cables aren't versioned. They're just rated in categories for attenuation exactly like copper phone wiring is and named for the connector type just like USB-A, USB-C, micro-USB, etc are. You don't have HDMI 1.3 and HDMI 1.4 cables, though; cables bought years before a HDMI version is announced can still work with any of that new version's features that work within the bandwidth that cable can carry. The version is for the HDMI spec which the receiver must support. HDMI isn't just a cable, it's also the hardware encoding and decoding signals, and the different versions define new and different ways of encoding and decoding digital media. As for 'headphone jack 1.4' and 'RCA jack 7.6'-- back in the day we had analogue audio and video signals and invented new types of jack, connector, and cable to carry them. You had RCA jacks, and 3.5mm jacks, and 1/4" audio jacks, and component video jacks, and S-video jacks, and SCART jacks, and coax jacks. Now we have digital audio and video and consistently use HDMI to carry it; instead of inventing new connectors we update the HDMI spec and say "Systems meeting the 1.3 spec can only transmit 1080p over their HDMI cables, and systems meeting the 1.4 spec can transmit 1080p over those cables." Isn't that better, and simpler? Instead of 20 types of cable with different features, we just use one type of cable, and add features to it over time.