nrf: Add SD 6.0.0-6.alpha to the download script
nrf: Add SD 6.0.0-6.alpha to the download script

adafruit/micropython,adafruit/circuitpython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython,adafruit/micropython,adafruit/circuitpython