newt/downoader: Update commits map after a fetch #317

Job	Run time
populate-targets	3s
newt dump (bleprph-nrf52840pdk, macos-latest)	41s
newt dump (boot-nrf52dk, ubuntu-latest)	28s
newt dump (boot-nrf52dk, macos-latest)	28s
newt dump (boot-nrf52dk, windows-latest)	1m 4s
newt dump (btshell-nrf52840pdk, macos-latest)	34s
newt dump (bleprph-nrf52840pdk, windows-latest)	2m 6s
newt dump (bleprph-nrf52840pdk, ubuntu-latest)	24s
newt dump (btshell-nrf52840pdk, ubuntu-latest)	25s
newt dump (btshell-nrf52dk, macos-latest)	33s
newt dump (my_blinky_sim, windows-latest)	1m 41s
newt dump (my_blinky_sim, ubuntu-latest)	23s
newt dump (my_blinky_sim, macos-latest)	48s
newt dump (btshell-nrf52dk, ubuntu-latest)	25s
newt dump (btshell-nrf52840pdk, windows-latest)	1m 57s
newt dump (btshell-nrf52dk, windows-latest)	1m 10s
	13m 10s

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