fix: use correct k8s version in custom sigstore tuf kuttl test (#8707) #10

Job	Run time
publish-images	50m 24s
generate-kyverno-cli-provenance / detect-env	5s
generate-background-controller-provenance / detect-env	10s
generate-cleanup-controller-provenance / detect-env	6s
generate-kyverno-init-provenance / detect-env	3s
generate-kyverno-provenance / detect-env	3s
generate-reports-controller-provenance / detect-env	3s
generate-kyverno-provenance / generator	17s
generate-reports-controller-provenance / generator	21s
generate-kyverno-init-provenance / generator	24s
generate-kyverno-cli-provenance / generator	29s
generate-cleanup-controller-provenance / generator	15s
generate-background-controller-provenance / generator	20s
generate-kyverno-provenance / final	2s
generate-cleanup-controller-provenance / final	2s
generate-reports-controller-provenance / final	1s
generate-kyverno-init-provenance / final	1s
generate-kyverno-cli-provenance / final	1s
generate-background-controller-provenance / final	1s
	53m 8s

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