[StepSecurity] ci: Harden GitHub Actions

## Summary This pull request is created by [StepSecurity](https://app.stepsecurity.io/securerepo) at the request of @mpromonet. Please merge the Pull Request to incorporate the requested changes. Please tag @mpromonet on your message if you have any questions related to the PR. ## Security Fixes ### Pinned Dependencies GitHub Action tags and Docker tags are mutable. This poses a security risk. GitHub's Security Hardening guide recommends pinning actions to full length commit. - [GitHub Security Guide](https://docs.github.com/en/actions/security-guides/security-hardening-for-github-actions#using-third-party-actions) - [The Open Source Security Foundation (OpenSSF) Security Guide](https://github.com/ossf/scorecard/blob/main/docs/checks.md#pinned-dependencies) ## Feedback For bug reports, feature requests, and general feedback; please email support@stepsecurity.io. To create such PRs, please visit https://app.stepsecurity.io/securerepo. Signed-off-by: StepSecurity Bot <bot@stepsecurity.io>