fix: add adc ref to rp channel creation funcs #4559
Draft
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Potential fix for #4558.
I've applied the change for both new_pin() and new_temp_sensor(), but in my testing it seems that it's only necessary for new_temp_sensor(), at least on rp2040.
It's really an API question whether we should include it for symmetry between the different calls, or only include it for the function that it's necessary for.
Will convert it from draft once this has an answer, but I thought it was worth showing what effect it will have on examples.