Pin Node.js to 24.15.0 in CI workflows

[pnts-se-whereby]

Description

Summary: Pin node-version to 24.15.0 in all GitHub Actions workflows so CI runs against a fixed Node.js version instead of floating to the latest 24.x. .nvmrc is left unchanged (v24) so local development still tracks the latest.

Related Issue:

Testing

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Checklist

• My code follows the project's coding standards.
• Prefixed the PR title and commit messages with the service or package name
• I have written unit tests (if applicable).
• I have updated the documentation (if applicable).
• By submitting this pull request, I confirm that my contribution is made
  under the terms of the MIT license.

Additional Information

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Latest commit: a4bf435

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[richtrwhereby]

LGTM 🚀 Fix as suggested here: microsoft/playwright#40724 (comment)