Merge upstream changes from Marlin 2.1.2

buildroot/share/vscode/create_custom_upload_command_CDC.py

@@ -13,7 +13,7 @@
 from __future__ import print_function
 from __future__ import division
 
-import subprocess,os,sys,platform
+import subprocess,os,platform
 from SCons.Script import DefaultEnvironment
 
 current_OS = platform.system()

buildroot/share/vscode/create_custom_upload_command_DFU.py

@@ -9,7 +9,7 @@
 #  Will continue on if a COM port isn't found so that the compilation can be done.
 #
 
-import os,sys
+import os
 from SCons.Script import DefaultEnvironment
 import platform
 current_OS = platform.system()