Update vendor by hack/update-vendor.sh.

Author: RainbowMango

staging/src/k8s.io/component-base/metrics/testutil/BUILD

@@ -4,6 +4,7 @@ go_library(
     name = "go_default_library",
     srcs = [
         "metrics.go",
+        "promlint.go",
         "testutil.go",
     ],
     importmap = "k8s.io/kubernetes/vendor/k8s.io/component-base/metrics/testutil",
@@ -13,6 +14,7 @@ go_library(
         "//staging/src/k8s.io/apimachinery/pkg/version:go_default_library",
         "//staging/src/k8s.io/component-base/metrics:go_default_library",
         "//vendor/github.com/prometheus/client_golang/prometheus/testutil:go_default_library",
+        "//vendor/github.com/prometheus/client_golang/prometheus/testutil/promlint:go_default_library",
         "//vendor/github.com/prometheus/client_model/go:go_default_library",
         "//vendor/github.com/prometheus/common/expfmt:go_default_library",
         "//vendor/github.com/prometheus/common/model:go_default_library",
@@ -37,6 +39,7 @@ go_test(
     name = "go_default_test",
     srcs = [
         "metrics_test.go",
+        "promlint_test.go",
         "testutil_test.go",
     ],
     embed = [":go_default_library"],