incompatible with FNB58 using firmware V0.68

[maribu]

After updating to firmware V0.68 running the script causes the device to freeze and the script to get a timeout error. Setting refresh to 0.003 in

fnirsi-usb-power-data-logger/fnirsi_logger.py

Line 304 in 74c950f

refresh = 1.0 if is_fnb58_or_fnb48s else 0.003 # 1 s for FNB58 / FNB48S, 3 ms for others

fixes the issue for me.

Sorry, I do not have a time to figure out a way to detect the firmware version, trace down since which firmware version the behavior has changed, and create a PR. But maybe just dumping this info here already helps others.