[llvm] List psutil as a dependency in pyproject.toml (PR #194285)

[Alexander Richardson via llvm-commits]

arichardson wrote:

I tried to get the dynamic version working, but using setup tools have me various issues since the top-level is not a python project and hatchling would need a more flexible regex option to parse the version. 

I also tried getting Gemini to fix this issue but it also failed to do anything useful.

I'd be inclined to just leave the hardcode version for now unless you know how to fix this. 

https://github.com/llvm/llvm-project/pull/194285