[release-4.14] Makefile: bump setup-envtest to release-0.19

[yanirq]

Manual cherrypick of #3270

The GCS bucket (storage.googleapis.com/kubebuilder-tools) used by setup-envtest release-0.18 to download envtest binaries is deprecated and now returns 401 Unauthorized, causing controller tests to fail.

Release-0.19 downloads binaries from the new location (GitHub releases) as recommended by the kubebuilder maintainers.

Ref: kubernetes-sigs/kubebuilder#4082

[openshift-ci]

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[yanirq]

/cc @ffromani

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[openshift-ci]

@yanirq: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/ci-unit	6f430c2	link	true	/test ci-unit

Full PR test history. Your PR dashboard.

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[ffromani]

/lgtm

[ffromani]

the unit test failure is real: go: sigs.k8s.io/controller-runtime/tools/setup-envtest@release-0.19 (in sigs.k8s.io/controller-runtime/tools/setup-envtest@v0.0.0-20250308055145-5fe7bb3edc86): go.mod:3: invalid go version '1.22.0': must match format 1.23

meaning we need to update our toolchain if we want to consume this change

[yanirq]

/hold