update version in version checker (#239)

diff --git a/.github/scripts/kernel_checker.py b/.github/scripts/kernel_checker.py
index 3d96d05..1a48000 100755
--- a/.github/scripts/kernel_checker.py
+++ b/.github/scripts/kernel_checker.py
@@ -35,7 +35,7 @@
 
 KERNEL_HEADER = [
     '/*\n',
-    ' * FreeRTOS Kernel V10.4.2\n',
+    ' * FreeRTOS Kernel V10.4.3\n',
     ' * Copyright (C) 2020 Amazon.com, Inc. or its affiliates.  All Rights Reserved.\n',
     ' *\n',
     ' * Permission is hereby granted, free of charge, to any person obtaining a copy of\n',