Update metadata-syntax.md for node 24

[TWiStErRob]

Why:

It is supported: https://github.com/actions/runner/releases/tag/v2.327.1

It is used: https://github.com/actions/checkout/releases/tag/v5.0.0

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

See title and diff.

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.

[Copilot]

Pull Request Overview

This PR updates the GitHub Actions metadata syntax documentation to include support for Node.js v24. The change reflects that Node.js v24 is now supported by GitHub Actions runners and is being used in production actions like checkout@v5.

• Updates all code examples from node20 to node24
• Adds documentation for the new node24 runtime option
• Updates section heading to reflect Node.js v24 instead of v20

[github-actions]

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Table of review links

Note: Please update the URL for your staging server or codespace.

The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on a staging server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/reference/workflows-and-actions/metadata-syntax.md	fpt ghec ghes@ 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.17 3.16 3.15 3.14

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

🤖 This comment is automatically generated.

[salmanmkc]

Thanks!

[github-actions]

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