Despite my googling, I can't find a keyboard shortcut (or any shortcut) to jump to the next conflict when you're in viewing a file in conflict mode (opening a file marked (C) in the source control panel, where the Accept Current Change | Accept Incoming Change | etc
menu is shown).
Note: This is different than compare mode where adds and dels are marked with red and green and F7 or the arrows works.
You are looking for these commands:
// merge-conflict.next
// merge-conflict.previous
So you can put something like this in your keybindings.json
file:
{
"key": "<your key here>",
"command": "merge-conflict.next"
},