pybricks / pybricks-micropython / 5156937283

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pbio/uartdev: fix sync on city hub

The flush needs to be immediately before the read, otherwise the read
buffer can contain garbage that was read while sending the baud rate.
Also, the ACK usually comes in < 1 ms so we don't need to wait so long.
This improves the chances of not missing data if the ACK doesn't come,
e.g. on the BOOST Color Distance sensor.

Fixes: https://github.com/pybricks/support/issues/747

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