[llvm] [mlir] [mlir python] Add nanobind support for standalone dialects. (PR #117922)

[Mehdi Amini via llvm-commits]

joker-eph wrote:

I don't think the bots are using the requirements.txt from the repo still (unfortunately), we'll likely have to manually re-deploy images instead.

https://github.com/llvm/llvm-project/pull/117922