return type of Literal[False] to help static analysis

Author: mikeshardmind

src/async_utils/priority_sem.py

@@ -139,8 +139,9 @@ async def __aenter__(self) -> None:
         prio = _priority.get()
         await self.__acquire(prio)
 
-    async def __aexit__(self, *dont_care: object) -> None:
+    async def __aexit__(self, *dont_care: object) -> t.Literal[False]:
         self.__release()
+        return False
 
     async def __acquire(self, priority: int, /) -> bool:
         if not self.__locked():