Increase rootfs size to 270Mb #8798

Job	Run time
packages (buildjet-4vcpu-ubuntu-2204-arm, arm64)	2m 4s
packages (buildjet-4vcpu-ubuntu-2004, amd64)	2m 13s
packages (buildjet-4vcpu-ubuntu-2004, riscv64)	1m 41s
eve (arm64, xen, generic)	6m 46s
eve (arm64, kvm, generic)	6m 45s
eve (amd64, xen, generic)	6m 57s
eve (amd64, kvm, generic)	7m 35s
eve (riscv64, mini, generic)	2m 54s
eve (amd64, kvm, rt)	6m 36s
eve (arm64, kvm, nvidia)	9m 14s
eve (arm64, kvm, imx8mp_pollux)	7m 13s
eve (arm64, kvm, imx8mp_epc_r3720)	7m 8s
	1h 7m 6s

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