Update requirements.txt
Update requirements.txt

Add an upper bound to the API version of pyusb.

Co-Authored-By: c1728p9 <dbd1610fcd0b261b9a289fd7427c9fd416cbbb6a@hotmail.com>

kjbracey-arm/mbed,andcor02/mbed-os,mbedmicro/mbed,andcor02/mbed-os,mbedmicro/mbed,mbedmicro/mbed,mbedmicro/mbed,andcor02/mbed-os,andcor02/mbed-os,mbedmicro/mbed,kjbracey-arm/mbed,andcor02/mbed-os,andcor02/mbed-os,kjbracey-arm/mbed,kjbracey-arm/mbed