Bump github.com/Microsoft/hcsshim from 0.11.4 to 0.12.5 #176

Job	Run time
Check whether tests need to be run based on diff	21s
Build Flow Aggregator image to be used for Kind e2e tests	2m 32s
Build Antrea image to be used for Kind e2e tests	4m 32s
E2e tests on a Kind cluster on Linux	43m 6s
E2e tests on a Kind cluster on Linux with all features enabled	53m 12s
E2e tests on a Kind cluster on Linux (hybrid)	35m 44s
E2e tests on a Kind cluster on Linux with non default values (proxyAll=true, LoadBalancerMode=DSR...	44m 51s
E2e tests on a Kind cluster on Linux for Flow Visibility	27m 52s
E2e tests on a Kind cluster on Linux (noEncap)	36m 1s
API compatible with client version N-1	8m 54s
NetworkPolicy conformance tests on a Kind cluster on Linux	8m 34s
Antrea-native (VLAN) secondary network tests on a Kind cluster on Linux	4m 12s
Upgrade from Antrea version N-1	9m 18s
Upgrade from Antrea version N-2	9m 36s
Test installation using 'antctl check' command	3m 11s
API compatible with client version N-2	8m 39s
Validate metrics in Prometheus document match running deployment's	2m 11s
Delete uploaded images	0s
	5h 2m 46s

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