Firmware build

Bump actions/upload-artifact from 3.1.3 to 4.0.0 #831

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Run time

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Job	Run time
build_dfu (PUCKJS)	1m 10s
build_main (LINUX)	26s
build_padded (ESPRUINOBOARD)	52s
build_dfu (PIXLJS)	1m 21s
build_main (ESP32)	27s
build_dfu (MDBT42Q)	1m 13s
build_main (ESP8266_BOARD)	19s
build_padded (PICO_R1_3)	1m 7s
build_dfu (BANGLEJS)	1m 34s
build_main (ESP8266_4MB)	19s
build_padded (ESPRUINOWIFI)	1m 9s
build_dfu (BANGLEJS2)	1m 50s
build_main (MICROBIT1)	43s
build_dfu (PUCKJS_MINIMAL)	1m 4s
build_main (MICROBIT2)	1m 25s
	14m 59s