ruff

969c8a54 - [ty] Synthesize `__delitem__` for TypedDict to allow deleting non-required keys (#22122)

[ty] Synthesize `__delitem__` for TypedDict to allow deleting non-required keys (#22122) ## Summary TypedDict now synthesizes a proper `__delitem__` method that... - ...allows deletion of `NotRequired` keys and keys in `total=False` TypedDicts. - ...rejects deletion of required keys (synthesizes `__delitem__(k: Never)`).