v0.8.0-rc.5

Changelog

• 63a5f55: ci: bump actions/cache to the node24 v6.1.0 release (@joshua-temple)
• 224670e: fix(ci): label the failure-report log region as excerpt not tail (@joshua-temple)
• 4a6ba15: fix(ci): surface action-pins remediation in the PR failure report (@joshua-temple)
• 308fd8a: fix(release): assert required release assets by presence in auto-promote (#460) (@joshua-temple)
• f5ae3c1: fix(release): migrate cosign signing to the Sigstore bundle format (#459) (@joshua-temple)