Fix nanopb CI (#115) #465

Job	Run time
build-firmware	2m 32s
build-plugins (shrapnel, Release)	5m 46s
ctest-sanitize (Release)	15m 12s
ctest (Release)	7m 50s
build-plugins (shrapnel, Debug)	4m 59s
ctest (Debug)	6m 19s
ctest-sanitize (Debug)	8m 34s
flutter-analyze	2m 2s
flutter-format	1m 52s
license-headers	51s
flutter-test	2m 38s
coveralls-finish	2s
	58m 37s

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