How do you skip a City Ranged Attack in Civilization 6?
Solution 1:
In later patches you appear to be able to just right click on todo items to pass on them (as in civ v).
Solution 2:
I had the same problem. I solved it by disabling the Auto End Turn. The city attack symbol still appears on the map but the symbol in the bottom right corner of the screen is the End Turn Arrow instead of the City Attack symbol.
Solution 3:
You can go onto "options" in the top right corner, and then go to "city ranged attack turn blocking" and disable that.