nRF52840 CLUE revision coming soon

Another revision! This time, it's the CLUE! (https://www.adafruit.com/product/4500) This board had a ton of unavailable sensors: the LSM6DS33 was discontinued, then the LIS3MDL price went up to $5 each, the BMP280 also went EOL, and finally, the APDS9960 was last-time-buy. We have enough to get these back in stock by swapping the LSM6DS3 for the DS33.