Update Node.js version to 24.x in tutorial

[kohtala]

Why:

Closes:

What's being changed (if available, include any code snippets, screenshots, or gifs):

Node 20 is EOL and runners and most actions already have been upgraded to Node 24.

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

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[github-actions]

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Table of review links

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Source	Review	Production	What Changed
actions/tutorials/create-actions/create-a-javascript-action.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

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[Copilot]

Pull request overview

Updates the JavaScript action tutorial to use the current Node.js runtime.

Changes:

• Updates the prerequisite to Node.js 24.x.
• Updates action metadata to use node24.

[github-actions]

Thanks for opening a pull request! We've triaged this issue for technical review by a subject matter expert 👀

[Sharra-writes]

@kohtala We'll ask the Actions team about this and let you know!