ci: Check vendor folder sync

dep ensure -dry-run -no-vendor will check and show if vendor code is out
of sync with GOpkg files but always has a return code of 0. Switching it
to dep check will fail if Gopkg is not in sync with vendor.

Fixes: kata-containers#1794
Fixes: kata-containers#1733
Signed-off-by: Ganesh Maharaj Mahalingam <ganesh.mahalingam@intel.com>

.ci/static-checks.sh

@@ -808,7 +808,7 @@ static_check_vendor()
 	go get github.com/golang/dep/cmd/dep
 
 	# Check, but don't touch!
-	dep ensure -no-vendor -dry-run
+	dep check
 }
 
 static_check_xml()