Warning: 'Lock levels' are deprecated, now a noop [Deprecated]
Apparently with nim 2.0 lock levels were done away with. 
Where previously we had `{.locks: 0.}` to signify that this code would never acquire a lock, we now don't.

According to Rika on the discord it **should** be fine to just remove those as they shouldn't be needed anymore, but I'm not insanely sure on that.
There appears to be no new way at least to express "This code should never acquire a lock" (At least I think that:s what locks:0 expressed).

I opened a forum thread to ask about this topic: https://forum.nim-lang.org/t/10487#69953

The "development" for this ticket is a pretty simple Find-replace of locks: 0 with either nothing or whatever the solution is.