Update files.py to include abc.ABC in context manager type.
@@ -407,7 +407,7 @@ class MultiprocessingFileReader(FileReader):
return fp.read()
-class AsyncReaderContextManager(typing.Generic[ReaderImplT]):
+class AsyncReaderContextManager(abc.ABC, typing.Generic[ReaderImplT]):
"""Context manager that returns a reader."""
__slots__: typing.Sequence[str] = ()
