[llvm] [lldb] Configure pyright to the documented minimum python version (PR #162952)

[David Spickett via llvm-commits]

DavidSpickett wrote:

Hang on, this is still in the top level pyproject. Which I suppose is how it has to be. Hmm.

Well, see what others think anyway.

https://github.com/llvm/llvm-project/pull/162952