chore: promote k8s.io/mount-utils to direct dependency

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: tryuuu

go.mod

@@ -9,6 +9,7 @@ require (
 	k8s.io/api v0.36.0
 	k8s.io/apimachinery v0.36.0
 	k8s.io/client-go v0.36.0
+	k8s.io/mount-utils v0.36.0
 )
 
 require (
@@ -44,7 +45,6 @@ require (
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	k8s.io/klog/v2 v2.140.0 // indirect
 	k8s.io/kube-openapi v0.0.0-20260317180543-43fb72c5454a // indirect
-	k8s.io/mount-utils v0.36.0 // indirect
 	k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
 	sigs.k8s.io/randfill v1.0.0 // indirect