Add '--no-single-branch' to shallow clone #224

Job	Run time
populate-targets	3s
newt dump (bleprph-nrf52840pdk, ubuntu-latest)	21s
newt dump (bleprph-nrf52840pdk, windows-latest)	1m 4s
newt dump (bleprph-nrf52840pdk, macos-latest)	48s
newt dump (boot-nrf52dk, ubuntu-latest)	21s
newt dump (boot-nrf52dk, windows-latest)	1m 11s
newt dump (boot-nrf52dk, macos-latest)	31s
newt dump (btshell-nrf52840pdk, ubuntu-latest)	22s
newt dump (btshell-nrf52840pdk, windows-latest)	2m 4s
newt dump (btshell-nrf52840pdk, macos-latest)	28s
newt dump (btshell-nrf52dk, ubuntu-latest)	21s
newt dump (btshell-nrf52dk, windows-latest)	1m 46s
newt dump (btshell-nrf52dk, macos-latest)	54s
newt dump (my_blinky_sim, ubuntu-latest)	21s
newt dump (my_blinky_sim, windows-latest)	1m 3s
newt dump (my_blinky_sim, macos-latest)	28s
	12m 6s

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