Update workflows to use actions running on Node24

I'm currently getting the following warnings when using the cypress split reusable workflow:

```
Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/upload-artifact@v4, cypress-io/github-action@v6. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/
```

Can the actions within the reusable workflows be updated to versions running on Node24 to remove these warnings?

Locate the reusable workflow files, including the Cypress split workflow, and inspect references to actions/checkout, actions/upload-artifact, and cypress-io/github-action. Check the available Node24-compatible action versions and update the workflow references; done means the reusable workflows use those versions without the reported Node.js 20 warnings.

Written by the indexing model from the issue text.