Bump action runtime from node20 to node24

[m-wayne]

Description

Bumps action.yml runtime declaration from node20 to node24. GitHub is deprecating Node.js 20 actions: runners default to Node 24 on 2026-06-02, and Node 20 is removed from runners on 2026-09-16. Consumer workflows (e.g. scribd/scribd-android) have started emitting deprecation warnings for this action.

The bundled dist/index.js is pre-compiled JS and runs as-is on Node 24, so no rebuild is required.

Testing considerations

No tests exist in this repo. Verification will happen via a consumer workflow run after the floating tag is moved to the merge commit.

Checklist

• Prefixed the PR title with the JIRA ticket code
• Performed simple, atomic commits with good commit messages
• Verified that the commit history is linear and commits are squashed as necessary
• Thoroughly tested the changes
• The appropriate complexity label (Low, Medium, High) is added to this PR
• Test Coverage of changes (if applicable)
• Updated the README.md as necessary
• I have confirmed and checked all of these boxes

Related links

• GitHub Node 20 deprecation notice (Actions runtime upgrades)

Follow-up

After merge, move the floating consumer-pinned tag to the merge commit so existing consumers pick up the change automatically.