[1.2] runc update: fix updating swap for cgroup v2 #6925

Job	Run time
cross-i386	1m 24s
test (ubuntu-20.04, 1.22.x, rootless, -race)	7m 20s
test (ubuntu-20.04, 1.22.x, rootless)	6m 51s
test (ubuntu-20.04, 1.22.x, -race)	8m 15s
test (ubuntu-20.04, 1.22.x)	7m 14s
test (ubuntu-20.04, 1.23.x, rootless, -race)	7m 27s
test (ubuntu-20.04, 1.23.x, rootless)	7m 1s
test (ubuntu-20.04, 1.23.x, -race)	7m 53s
test (ubuntu-20.04, 1.23.x)	7m 10s
test (ubuntu-20.04, 1.23.x, criu-dev)	7m 38s
test (ubuntu-24.04, 1.22.x, rootless, -race)	9m 34s
test (ubuntu-24.04, 1.22.x, rootless)	9m 37s
test (ubuntu-24.04, 1.22.x, -race)	8m 0s
test (ubuntu-24.04, 1.22.x)	7m 18s
test (ubuntu-24.04, 1.23.x, rootless, -race)	9m 33s
test (ubuntu-24.04, 1.23.x, rootless)	9m 10s
test (ubuntu-24.04, 1.23.x, -race)	7m 53s
test (ubuntu-24.04, 1.23.x)	7m 23s
test (ubuntu-24.04, 1.23.x, criu-dev)	7m 31s
test (actuated-arm64-6cpu-8gb, 1.23.x, rootless)	11m 31s
test (actuated-arm64-6cpu-8gb, 1.23.x)	8m 10s
all-done	1s
	2h 43m 54s

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