fix(deps): update module github.com/fluxcd/pkg/apis/kustomize to v1.15.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
github.com/fluxcd/pkg/apis/kustomize	require	minor	v1.14.0 → v1.15.0

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about this update again.

---

• If you want to rebase/retry this PR, check this box

---

This PR was generated by Mend Renovate. View the repository job log.

[renovate]

ℹ️ Artifact update notice

File name: api/go.mod

In order to perform the update(s) described in the table above, Renovate ran the go get command, which resulted in the following additional change(s):

• 8 additional dependencies were updated

Details:

Package	Change
github.com/go-logr/logr	v1.4.2 -> v1.4.3
go.yaml.in/yaml/v2	v2.4.2 -> v2.4.3
golang.org/x/net	v0.45.0 -> v0.49.0
golang.org/x/text	v0.29.0 -> v0.33.0
k8s.io/apiextensions-apiserver	v0.34.2 -> v0.35.0
k8s.io/apimachinery	v0.34.2 -> v0.35.0
k8s.io/utils	v0.0.0-20250604170112-4c0f3b243397 -> v0.0.0-20251002143259-bc988d571ff4
sigs.k8s.io/json	v0.0.0-20241014173422-cfa47c3a1cc8 -> v0.0.0-20250730193827-2d320260d730