Heads up: nest-asyncio is no longer actively maintained

Unfortunately, Ewald de Wit, the maintainer of `nest-asyncio`, passed away in March 2024. The project is now archived on GitHub.

It should still work as before\u2014only one test is currently failing with Python 3.14 alpha 6: `test_timeout`.

Since it's a dependency here, I thought I'd let you know. The project may eventually need new maintainers.