Now that a fix for tokio#6133 is available, try fully asynchronous pipes again
Tokio 1.34 contains a fix for #6133 which sounds suspiciously like our missed write readiness notifications hanging external harvesters and this change bumps Tokio and changes the external harvester driver to make use of fully asynchronous pipes again thereby avoid the cost of block_in_place
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Edited by Adam Reichold