I feel like this solution hallucinated the concept of Workflow Lock File (.lock.yml), which is not available in Github Actions. This is a missing feature that would solve the security risk of changing git tag references when calling to actions like utility@v1
You can already hardcode the sha of a given workflow in the ref, and arguably should do that anyways.
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I think in this context they mean “lock” as in “these are the generated contents corresponding to your source markdown,” not as in “this is a lockfile.” But I think that’s a pretty confusing overlap for them to have introduced, given that a lack of strong dependency pinning is a significant ongoing pain point in GHA.