Remove unnecessary pylint: disable=no-member

This rule is now disabled globally, as it is already checked by `mypy`
and `pylint` have some false positives, like this one.

Signed-off-by: Leandro Lucarella <[email protected]>

Author: llucax

src/frequenz/channels/_receiver.py

@@ -237,10 +237,7 @@ async def receive(self) -> ReceiverMessageT_co:  # noqa: DOC503
             # introduced by __anext__.
             if (
                 isinstance(exc.__cause__, ReceiverStoppedError)
-                # pylint is not smart enough to figure out we checked above
-                # this is a ReceiverStoppedError and thus it does have
-                # a receiver member
-                and exc.__cause__.receiver is self  # pylint: disable=no-member
+                and exc.__cause__.receiver is self
             ):
                 raise exc.__cause__
             raise ReceiverStoppedError(self) from exc