fix(deps): update module sigs.k8s.io/kustomize/api to v0.21.1

| datasource | package                   | from    | to      |
| ---------- | ------------------------- | ------- | ------- |
| go         | sigs.k8s.io/kustomize/api | v0.21.0 | v0.21.1 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

go.mod

@@ -24,8 +24,8 @@ require (
 	k8s.io/client-go v0.35.0
 	k8s.io/utils v0.0.0-20260210185600-b8788abfbbc2
 	sigs.k8s.io/controller-runtime v0.23.1
-	sigs.k8s.io/kustomize/api v0.21.0
-	sigs.k8s.io/kustomize/kyaml v0.21.0
+	sigs.k8s.io/kustomize/api v0.21.1
+	sigs.k8s.io/kustomize/kyaml v0.21.1
 )
 
 require (

go.sum

@@ -336,10 +336,10 @@ sigs.k8s.io/gateway-api v1.4.0 h1:ZwlNM6zOHq0h3WUX2gfByPs2yAEsy/EenYJB78jpQfQ=
 sigs.k8s.io/gateway-api v1.4.0/go.mod h1:AR5RSqciWP98OPckEjOjh2XJhAe2Na4LHyXD2FUY7Qk=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5EXP7sU1kvOlxwZh5txg=
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
-sigs.k8s.io/kustomize/api v0.21.0 h1:I7nry5p8iDJbuRdYS7ez8MUvw7XVNPcIP5GkzzuXIIQ=
-sigs.k8s.io/kustomize/api v0.21.0/go.mod h1:XGVQuR5n2pXKWbzXHweZU683pALGw/AMVO4zU4iS8SE=
-sigs.k8s.io/kustomize/kyaml v0.21.0 h1:7mQAf3dUwf0wBerWJd8rXhVcnkk5Tvn/q91cGkaP6HQ=
-sigs.k8s.io/kustomize/kyaml v0.21.0/go.mod h1:hmxADesM3yUN2vbA5z1/YTBnzLJ1dajdqpQonwBL1FQ=
+sigs.k8s.io/kustomize/api v0.21.1 h1:lzqbzvz2CSvsjIUZUBNFKtIMsEw7hVLJp0JeSIVmuJs=
+sigs.k8s.io/kustomize/api v0.21.1/go.mod h1:f3wkKByTrgpgltLgySCntrYoq5d3q7aaxveSagwTlwI=
+sigs.k8s.io/kustomize/kyaml v0.21.1 h1:IVlbmhC076nf6foyL6Taw4BkrLuEsXUXNpsE+ScX7fI=
+sigs.k8s.io/kustomize/kyaml v0.21.1/go.mod h1:hmxADesM3yUN2vbA5z1/YTBnzLJ1dajdqpQonwBL1FQ=
 sigs.k8s.io/randfill v1.0.0 h1:JfjMILfT8A6RbawdsK2JXGBR5AQVfd+9TbzrlneTyrU=
 sigs.k8s.io/randfill v1.0.0/go.mod h1:XeLlZ/jmk4i1HRopwe7/aU3H5n1zNUcX6TM94b3QxOY=
 sigs.k8s.io/structured-merge-diff/v6 v6.3.2-0.20260122202528-d9cc6641c482 h1:2WOzJpHUBVrrkDjU4KBT8n5LDcj824eX0I5UKcgeRUs=