Bump k8s.io/client-go from 0.26.1 to 0.27.3 #1113

Job	Run time
build-all	4m 26s
build	2m 24s
Basic file upload smoke	2m 46s
Basic dynamic config smoke	2m 22s
Basic 1+1 smoke (quay.io/footloose/ubuntu18.04)	2m 12s
Basic 1+1 smoke (quay.io/footloose/centos7)	2m 35s
Basic 1+1 smoke (quay.io/footloose/debian10)	2m 21s
Apply + backup + reset + restore (quay.io/footloose/ubuntu18.04)	2m 29s
Apply + backup + reset + restore (quay.io/footloose/centos7)	2m 32s
Init sub-command smoke test	2m 6s
OS override smoke test	1m 49s
Apply + reset (quay.io/footloose/ubuntu18.04)	2m 55s
Apply + reset (quay.io/footloose/centos7)	2m 32s
Upgrade (quay.io/footloose/ubuntu18.04, v1.21.6+k0s.0)	3m 8s
Upgrade (quay.io/footloose/centos7, v1.21.6+k0s.0)	2m 39s
	39m 16s

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