Hm, it's now showing 0.9.4 after I cloned another nodebb with:
git clone -b v0.9.3 https://github.com/NodeBB/NodeBB.git nodebb
Then moved .git from that installation to my forum nodebb.
Then I ran:
git checkout -f v0.9.x
git merge origin/v0.9.x
And ran ./nodebb upgrade
And ran npm install + npm update a few times.
I have no idea what all of this is supposed to do but since ACP is now showing 0.9.4 I suppose it's all right, right?
Please update the upgrade instructions - It doesn't seem like those git commands really do anything meaningful ... and there is no mention of npm update which eventually seemed to fix the issues I was having with Nodebb not updating...