Introduce `/upgrade-pylib-next` by moreal · Pull Request #6827 · RustPython/RustPython

This pull request updates `types` module to v3.14.2. While doing it, it
fixes also async-related feature. This pull request's base is generated
by #6827.

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## Summary by CodeRabbit

* **New Features**
* Generators that act as iterable coroutines are now recognized as
awaitable, improving async behavior.
* Yield-from and await interactions now handle coroutine-iterable
sources more consistently.

* **Bug Fixes**
* Reduces spurious TypeError cases when awaiting or yielding from
wrapped coroutine-like generators.

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