ci(actions): PLAT-3824 Update External GitHub Actions and Pin Full Commit SHAs

[argais]

What

Pin non-Finch external GitHub Actions to full commit SHAs while retaining exact version comments.

Why

Immutable action references prevent runtime drift and reduce supply-chain risk from mutable version tags.

Changes

• Updated external uses: references in GitHub Actions workflows to the latest resolved full commit SHA.
• Preserved Finch-API references, local actions, and docker:// references.
• Added exact version comments beside pinned references.

Notes

Validated changed workflows with actionlint and verified every external reference against the shared PLAT-3824 resolution map.

Closes: PLAT-3824

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📥 Commits

Reviewing files that changed from the base of the PR and between 9329703 and d6d098a.

📒 Files selected for processing (3)

• .github/workflows/ci.yml
• .github/workflows/publish-pypi.yml
• .github/workflows/release-doctor.yml

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