Update dep check (kubernetes-sigs#1056)

Signed-off-by: Vince Prignano <[email protected]>
(cherry picked from commit aecec29)

Author: vincepri

scripts/ci-is-vendor-in-sync.sh

@@ -22,4 +22,6 @@ REPO_ROOT=$(dirname "${BASH_SOURCE[0]}")/..
 
 cd "${REPO_ROOT}"
 find vendor -name 'BUILD.bazel' -delete
+
+go get -u github.com/golang/dep/cmd/dep
 dep check