Removing broken garden lights?

I am dealing with an old house that has a bunch of non-working garden lights that have electrical wiring under the lawn. I want to pull the lights out, but I don’t want to pull the wiring out as it will mean tearing up the garden.

If I pull the lights out, there will be bare wires. There is no current going through them and it’s low voltage anyway, Should I just leave the wires there and bury them, or cap them with something? Any advice?