fix(deps): update knative.dev/hack digest to 306ce74 #1125

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Status	Duration	Name
✅ Succeeded	4 minutes	init
✅ Succeeded	2 minutes	clone-repository
✅ Succeeded	4 minutes	prefetch-dependencies
✅ Succeeded	10 minutes	build-images
✅ Succeeded	13 minutes	build-image-index
✅ Succeeded	14 minutes	build-source-image
✅ Succeeded	14 minutes	deprecated-base-image-check
✅ Succeeded	14 minutes	clair-scan
✅ Succeeded	19 minutes	ecosystem-cert-preflight-checks
✅ Succeeded	19 minutes	clamav-scan
✅ Succeeded	20 minutes	sast-snyk-check
✅ Succeeded	19 minutes	apply-tags
✅ Succeeded	18 minutes	push-dockerfile
✅ Succeeded	18 minutes	rpms-signature-scan
✅ Succeeded	15 minutes	sast-unicode-check
✅ Succeeded	5 minutes	sast-shell-check
✅ Succeeded	5 minutes	show-sbom