[release-v1.15] Bump knative.dev/hack to 1.15 backport #1716

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-eventing-test-event-sender-115-on-pull-request-w5j7r" rel="nofollow">kn-eventing-test-event-sender-115-on-pull-request-w5j7r

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Status	Duration	Name
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🟢 Succeeded	33 seconds	prefetch-dependencies
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🟢 Succeeded	13 seconds	build-image-index
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🟢 Succeeded	35 seconds	clair-scan
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🟢 Succeeded	16 seconds	sast-shell-check
🟢 Succeeded	2 minutes	sast-snyk-check
🟢 Succeeded	26 seconds	show-sbom