fix(deps): update module github.com/fluxcd/pkg/apis/kustomize to v1.19.0

[renovate]

This PR contains the following updates:

Package	Type	Update	Change	OpenSSF
github.com/fluxcd/pkg/apis/kustomize	require	minor	v1.14.0 → v1.19.0

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[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):

• 7 additional dependencies were updated

Details:

Package	Change
go.yaml.in/yaml/v2	v2.4.2 -> v2.4.3
k8s.io/apiextensions-apiserver	v0.34.2 -> v0.36.1
k8s.io/apimachinery	v0.34.2 -> v0.36.1
k8s.io/klog/v2	v2.130.1 -> v2.140.0
k8s.io/utils	v0.0.0-20250604170112-4c0f3b243397 -> v0.0.0-20260210185600-b8788abfbbc2
sigs.k8s.io/json	v0.0.0-20241014173422-cfa47c3a1cc8 -> v0.0.0-20250730193827-2d320260d730
sigs.k8s.io/structured-merge-diff/v6	v6.3.0 -> v6.3.2