[2023] Stop calling EVERYTHING a "major update"

It is chosen to differentiate our significant content updates from hotfixes and other updates. This makes it easy for players to see what the actual content updates are for the game, versus the hotfixes.

This was the standard chosen during the beta weekends, when we had not planned the break-neck pace of weekly updates. The weekly update cadence would only be adopted later.

This is also standard for our other games at the studio, it is just only Icarus that currently does major updates every week.