Bump node from 20 to 24

[mcdonnnj]

🗣 Description

This pull request updates the action from the node20 runtime to the the node24 runtime.

💭 Motivation and context

Node.js 20 actions are deprecated and we get a warning in workflow runs that use them. Since this is one of our actions we need to update it to a newer Node.js version, and it makes sense to use the latest we can.

Note

I ran npm run package just to be sure but there were no changed to the distribution code.

🧪 Testing

Automated tests pass. I used this branch in a test branch and the run can be found here: https://github.com/cisagov/skeleton-generic/actions/runs/23249065398/job/67585710219.

✅ Pre-approval checklist

• This PR has an informative and human-readable title.
• Changes are limited to a single goal - eschew scope creep!
• All relevant type-of-change labels have been added.
• I have read the CONTRIBUTING document.
• These code changes follow cisagov code standards.
• All new and existing tests pass.
• Bump major, minor, patch, pre-release, and/or build versions as appropriate via the bump_version script if this repository is versioned and the changes in this PR warrant a version bump.

✅ Post-merge checklist

• Create a release (necessary if and only if the version was bumped).

[Copilot]

Pull request overview

This PR updates the repository’s JavaScript GitHub Action to target a newer Node.js runtime and aligns the Node engine/version metadata used for packaging and releases.

Changes:

• Update action.yml runtime from node20 to node24.
• Raise the Node.js engine requirement to >=24.
• Bump the project version from 1.2.1 to 2.0.0 (and sync in package-lock.json).

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 2 comments.

File	Description
action.yml	Switches the action runtime to node24.
package.json	Updates Node engine requirement and bumps version to 2.0.0.
package-lock.json	Syncs version/engine metadata with package.json.

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