[1.2] drop runc-dmz solution according to overlay solution #6881

Job	Run time
cross-i386	1m 23s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 24s
test (ubuntu-20.04, 1.22.x, rootless)	7m 13s
test (ubuntu-20.04, 1.22.x, -race)	7m 50s
test (ubuntu-20.04, 1.22.x)	6m 58s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 3s
test (ubuntu-20.04, 1.23.x, rootless)	7m 17s
test (ubuntu-20.04, 1.23.x, -race)	8m 4s
test (ubuntu-20.04, 1.23.x)	7m 27s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 40s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 43s
test (ubuntu-24.04, 1.22.x, rootless)	9m 36s
test (ubuntu-24.04, 1.22.x, -race)	7m 59s
test (ubuntu-24.04, 1.22.x)	7m 8s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 31s
test (ubuntu-24.04, 1.23.x, rootless)	9m 7s
test (ubuntu-24.04, 1.23.x, -race)	7m 24s
test (ubuntu-24.04, 1.23.x)	6m 37s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 10s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 27s
test (actuated-arm64-6cpu-8gb, 1.23.x)	7m 49s
all-done	1s
	2h 41m 51s

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