PlatformIO CI

Update GitHub Actions workflow to use actions/upload-artifact@v4 #862

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Run time

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Job	Run time
BOARD=mksgenlv21	53s
BOARD=mksgenlv2	59s
BOARD=mksgenlv1	56s
BOARD=esp32	2m 24s
BOARD=ramps	1m 5s
	6m 17s