PlatformIO CI

Peg AVR platform to 4.2.0 as 5.0.0 is broken and can't upload #831

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Run time

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Job	Run time
BOARD=mksgenlv21	11m 40s
BOARD=mksgenlv2	11m 47s
BOARD=mksgenlv1	3m 34s
BOARD=esp32	2m 17s
BOARD=ramps	11m 32s
	40m 50s