Plane: fixed FIRMWARE_VERSION for 4.3.8 #378

Job	Run time
build (stm32f7, chibios, 6)	18m 25s
build (stm32f7, chibios, 10)	20m 14s
build (stm32h7, chibios, 6)	14m 48s
build (stm32h7, chibios, 10)	21m 38s
build (fmuv2-plane, chibios, 10)	7m 13s
build (periph-build, chibios, 10)	28m 24s
build (iofirmware, chibios, 6)	1m 59s
build (iofirmware, chibios, 10)	1m 48s
build (CubeOrange-bootloader, chibios, 6)	1m 25s
build (CubeOrange-bootloader, chibios, 10)	1m 58s
build (revo-bootloader, chibios, 6)	1m 55s
build (revo-bootloader, chibios, 10)	1m 54s
build (stm32h7-debug, chibios, 6)	9m 0s
build (stm32h7-debug, chibios, 10)	9m 50s
build (fmuv3, chibios, 6)	20m 43s
build (fmuv3, chibios, 10)	15m 57s
build (revo-mini, chibios, 10)	16m 39s
build (MatekF405-Wing, chibios, 10)	14m 24s
build (CubeOrange-ODID, chibios, 10)	11m 24s
build (configure-all, chibios, 6)	10m 17s
build (configure-all, chibios, 10)	8m 23s
build (build-options-defaults-test, chibios, 6)	41m 1s
build (build-options-defaults-test, chibios, 10)	36m 26s
build (signing, chibios, 10)	14m 47s
build (stm32h7, chibios-py2)	17m 4s
	5h 47m 36s

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