add wmi to requirements for usb tests

Author: Jan Kamidra

tools/requirements.txt

@@ -25,6 +25,7 @@ six>=1.0,<2.0
 colorama>=0.3,<0.5
 pyjson5~=1.6
 humanize~=4.9.0
+wmi>=1.5; platform_system == "Windows"
 
 # Install pyocd so that it's available in the venv if the user chooses to use it
 pyocd