gjkim42: vendor: update cAdvisor to v0.38.7

JobBuild
98014
01-14 01:50
87344c8d
01-14 01:49
pull-kubernetes-bazel-build 1351602183270830080 1349533935331184640
pull-kubernetes-bazel-test 1351602183300190208 1349533935356350464
pull-kubernetes-dependencies 1351602183342133248 1349533935377321984
pull-kubernetes-e2e-gce-100-performance 1351602183241469952 1349661782133706752 1349648901518397440 1349617630041870336 1349561373561982976 1349547300527017984 1349533935314407424
pull-kubernetes-e2e-gce-ubuntu-containerd 1351602183165972480 1349533935264075776
pull-kubernetes-e2e-kind 1351602183446990848 1349533935423459328
pull-kubernetes-integration 1351602183371493376 1349533935398293504
pull-kubernetes-node-e2e 1351602183195332608 1349533935285047296
pull-kubernetes-typecheck 1351602183484739584 1349533935440236544
pull-kubernetes-verify 1351602183983861760 1349533935461208064