[llvm] [mlir] [mlir][python] Fix generation of Python bindings for `async` dialect (PR #75960)

[Maksim Levental via llvm-commits]

https://github.com/makslevental approved this pull request.

Dunno how I missed this at the time (at a certain point I thought I had python examples that ran through async but I guess not) and also this PR. Thank you very much for fixing this.

https://github.com/llvm/llvm-project/pull/75960