[release-v1.15] Bump knative.dev/hack to 1.15 backport #1610

Namespace: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/ocp-serverless-tenant" rel="nofollow">ocp-serverless-tenant
PipelineRun: <a href="https://konflux-ui.apps.kflux-prd-rh02.0fk9.p1.openshiftapps.com/ns/ocp-serverless-tenant/pipelinerun/kn-serving-scale-from-zero-115-on-pull-request-r65kk" rel="nofollow">kn-serving-scale-from-zero-115-on-pull-request-r65kk

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Status	Duration	Name
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🟢 Succeeded	17 seconds	clone-repository
🟢 Succeeded	20 seconds	prefetch-dependencies
🟢 Succeeded	2 minutes	build-images
🟢 Succeeded	14 seconds	build-image-index
🟢 Succeeded	38 seconds	sast-snyk-check
🟢 Succeeded	8 seconds	apply-tags
🟢 Succeeded	46 seconds	build-source-image
🟢 Succeeded	8 seconds	deprecated-base-image-check
🟢 Succeeded	35 seconds	clair-scan
🟢 Succeeded	17 seconds	sast-shell-check
🟢 Succeeded	36 seconds	sast-unicode-check
🟢 Succeeded	9 seconds	rpms-signature-scan
🟢 Succeeded	32 seconds	clamav-scan
🟢 Succeeded	22 seconds	ecosystem-cert-preflight-checks
🟢 Succeeded	9 seconds	push-dockerfile
🟢 Succeeded	6 seconds	show-sbom