chore: update node version

[beeme1mr]

This PR

• updates the .npmrc node version to v24
• reference the .npmrc version in GitHub actions

Notes

Unfortunately, publishing isn't working because the package.json specifies a node version that we aren't currently using for publishing.

https://github.com/open-feature/js-sdk-contrib/actions/runs/17834916002/job/50709535315

Our test matrix still checks older node versions, the .npmrc file recommends the latest stable release of Node.

[gemini-code-assist]

Summary of Changes

Hello @beeme1mr, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request primarily focuses on updating the project's Node.js versioning. It moves the .nvmrc configuration to Node.js v24 and adjusts the CONTRIBUTING.md to recommend Node.js v20+ for development. This ensures that the project leverages more current Node.js features and benefits from ongoing performance improvements and security updates.

Highlights

• Node.js Version Update: The .nvmrc file has been updated to specify Node.js version 24, aligning the project with a more recent runtime environment.
• Contribution Guidelines: The CONTRIBUTING.md file now recommends Node.js 20+ for contributors, updating the minimum required version for development.

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[gemini-code-assist]

Code Review

This pull request updates the project's Node.js version. The change in .nvmrc to version 24 is consistent with the engines field in package.json. However, the accompanying change in CONTRIBUTING.md updates the recommended version to 20+, which is inconsistent with the project's actual requirement of 24+. I've provided a suggestion to align the documentation. Also, please note that the PR description mentions updates to GitHub Actions, but those changes don't appear to be included in this pull request.