firmware: update heapless crate to 0.8.0

greatscottgadgets / cynthion

USB test instrument

https://greatscottgadgets.com/cynthion/

BSD 3-Clause "New" or "Revised" License

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Closed antoinevg closed 2 months ago

antoinevg commented 2 months ago

This PR updates the heapless crate to 0.8.0 and removes the version pin.