Upgraded to FreeRTOS long term support

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Upgraded to FreeRTOS long term support

We have upgraded to FreeRTOS V10.4.3. This means we are following the FreeRTOS LTS (long term support) release train now.

As quouted from the FreeRTOS website:

developers can rely on a FreeRTOS version that provides feature stability, and security patches and critical bug fixes for two years from release date.