Update bootloader to latest RC release #139

Job	Run time
read_targets_from_file / read_targets_from_file	3s
read_targets_from_file / read_targets_from_file	4s
read_targets_from_file / read_targets_from_file	3s
build (cf2)	2m 5s
build (cf2)	2m 4s
build (cf2)	2m 26s
build (bolt)	2m 3s
build (bolt)	2m 3s
build (bolt)	2m 10s
build (tag)	2m 5s
build (tag)	2m 3s
build (tag)	2m 16s
build (flapper)	2m 4s
build (flapper)	2m 2s
build (flapper)	2m 4s
	25m 35s

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