Fix pyserial read_all return type#15797
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Fixes #15619.
read_allwas typedbytes | Nonebut it just callsself.read(self.in_waiting)internally, andreadis already typed asbytes(with that long comment above explaining why pyserial overrides the io.RawIOBase contract). pyserial's docs back this up too — "Equivalent to ser.read(ser.in_waiting). Returns: Bytes read from the port."So just narrowed it to
bytesto match.