chore(deps): update module sigs.k8s.io/kubebuilder/v3 to v4 (#32)

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

Author: renovate[bot]

go.mod

@@ -324,7 +324,7 @@ require (
 	sigs.k8s.io/controller-runtime/tools/setup-envtest v0.0.0-20250918083545-961fc2c233d6 // indirect
 	sigs.k8s.io/controller-tools v0.19.0 // indirect
 	sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 // indirect
-	sigs.k8s.io/kubebuilder/v3 v3.15.1 // indirect
+	sigs.k8s.io/kubebuilder/v4 v4.9.0 // indirect
 	sigs.k8s.io/kustomize/api v0.20.1 // indirect
 	sigs.k8s.io/kustomize/cmd/config v0.20.1 // indirect
 	sigs.k8s.io/kustomize/kustomize/v5 v5.7.1 // indirect

go.sum

@@ -853,6 +853,7 @@ sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730 h1:IpInykpT6ceI+QxKBbEflcR5E
 sigs.k8s.io/json v0.0.0-20250730193827-2d320260d730/go.mod h1:mdzfpAEoE6DHQEN0uh9ZbOCuHbLK5wOm7dK4ctXE9Tg=
 sigs.k8s.io/kubebuilder/v3 v3.15.1 h1:a01OIfeZOew3gB2T65D97UxLC5zeEHy8FrNIgx349BE=
 sigs.k8s.io/kubebuilder/v3 v3.15.1/go.mod h1:/QwYUyLicWiNcdMAmV5lfWoslWz9Ro9L+AK8UQrQxbI=
+sigs.k8s.io/kubebuilder/v4 v4.9.0/go.mod h1:Xql7wLeyXBQ4lJJdi1Pl8T/DeV4UXpA1kaOEumN0pzY=
 sigs.k8s.io/kustomize/api v0.20.1 h1:iWP1Ydh3/lmldBnH/S5RXgT98vWYMaTUL1ADcr+Sv7I=
 sigs.k8s.io/kustomize/api v0.20.1/go.mod h1:t6hUFxO+Ph0VxIk1sKp1WS0dOjbPCtLJ4p8aADLwqjM=
 sigs.k8s.io/kustomize/cmd/config v0.20.1 h1:4APUORmZe2BYrsqgGfEKdd/r7gM6i43egLrUzilpiFo=