tests/int/tty: increase the timeout #5990

Job	Run time
cross-i386	1m 46s
cross-i386 (runc_nodmz)	1m 30s
test (ubuntu-20.04, 1.20.x, rootless, -race)	8m 26s
test (ubuntu-20.04, 1.20.x, rootless)	6m 0s
test (ubuntu-20.04, 1.20.x, -race)	7m 26s
test (ubuntu-20.04, 1.20.x)	6m 32s
test (ubuntu-20.04, 1.21.x, rootless, -race)	6m 36s
test (ubuntu-20.04, 1.21.x, rootless)	6m 5s
test (ubuntu-20.04, 1.21.x, -race)	7m 16s
test (ubuntu-20.04, 1.21.x)	6m 17s
test (ubuntu-20.04, 1.21.x, criu-dev)	6m 54s
test (ubuntu-22.04, 1.20.x, rootless, -race)	10m 13s
test (ubuntu-22.04, 1.20.x, rootless)	9m 59s
test (ubuntu-22.04, 1.20.x, -race)	8m 51s
test (ubuntu-22.04, 1.20.x)	8m 24s
test (ubuntu-22.04, 1.21.x, rootless, -race)	10m 46s
test (ubuntu-22.04, 1.21.x, rootless)	10m 20s
test (ubuntu-22.04, 1.21.x, -race)	8m 38s
test (ubuntu-22.04, 1.21.x)	7m 46s
test (ubuntu-22.04, 1.21.x, runc_nodmz)	7m 44s
test (ubuntu-22.04, 1.21.x, criu-dev)	8m 24s
test (actuated-arm64-6cpu-8gb, 1.21.x, rootless)	11m 15s
test (actuated-arm64-6cpu-8gb, 1.21.x)	7m 13s
	2h 54m 21s

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