ci: pin GitHub Actions dependencies to commit hashes #61
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This hardening is critical following multiple GitHub Actions supply chain attacks in March 2025, including the compromise of popular actions like
tj-actions/changed-files(CVE-2025-30066) andreviewdog/action-setup(CVE-2025-30154). Pinning to commit hashes prevents dependency confusion attacks and ensures reproducible builds by preventing automatic updates to potentially compromised versions.