Update to nrfx - fixes UART issue that consumes power even when shutdown #8825
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This fixes a bug in the previous nrfx implementation that failed to fully shut down the UART. This lead to a
sleep current consumption of ~1mA.
My initial attempt to fix this #8089 somehow broke the USB as described in #8391, so it was reverted.
This takes code from a later version of the nrfx firmware.