pacoxu: Automated cherry pick of #114093: use etcd 3.5.6-0 after promotion

JobBuild
1bcdbea6
11-24 09:20		 f846c928
11-24 09:15		 ecb1c156
11-24 09:11		 114106
11-24 09:11
pull-kubernetes-conformance-kind-ga-only-parallel 1598683892095651840 1595708867847655424 1595707687889276928 1595706681629609984
pull-kubernetes-conformance-kind-ipv6-parallel 1595708861531033600 1595707692482039808 1595706681361174528
pull-kubernetes-dependencies 1598683882029322240 1595708862365700096 1595707681186779136 1595706681415700480
pull-kubernetes-e2e-gce-100-performance 1598683883732209664 1595708859006062592 1595707678661808128 1595706681306648576
pull-kubernetes-e2e-gce-ubuntu-containerd 1598709397926711296 1598683878694850560 1595708855122137088 1595707673628643328 1595706681113710592
pull-kubernetes-e2e-kind 1598683887062487040 1595708864991334400 1595707683703361536 1595706681541529600
pull-kubernetes-e2e-kind-ipv6 1598683889742647296 1595708866606141440 1595707686190583808 1595706681591861248
pull-kubernetes-integration 1598683884541710336 1595708864043421696 1595707683250376704 1595706681482809344
pull-kubernetes-node-e2e-containerd 1598683882717188096 1595708868237725696 1595707676996669440 1595706681239539712
pull-kubernetes-typecheck 1598683897716019200 1595708870343266304 1595707689969651712 1595706682766266368
pull-kubernetes-unit 1598683894616428544 1595708869076586496 1595707688744914944 1595706681939988480
pull-kubernetes-verify 1598693343284432896 1598683900228407296 1595708870750113792 1595707690410053632 1595706683609321472
pull-kubernetes-verify-govet-levee 1598683878745182208 1595708855709339648 1595707674467504128 1595706681185013760