Return type of twisted.internet.defer._ConcurrencyPrimitive.__aexit__ should be Deferred[Literal[False]]

[euresti]

Describe the incorrect behavior you saw

I get lots of mypy errors (error: Missing return statement) when using DeferredLock

Describe how to cause this behavior

Run mypy on:

from twisted.internet.defer import DeferredLock

async def foo() -> int:
    lock = DeferredLock()
    async with lock:
        return 5

You'll get : foo.py:3: error: Missing return statement

Setting the return type to Literal[False] tells mypy that this context manager doesn't swallow exceptions.

Additional context
Add any other context about the problem here.

mypy 0.981 (compiled: yes)
Twisted==22.10.0