CI | Update Checkout Version

[shirady]

Explain the changes

1. Update the checkout version from 3 to 4.

Issues: Fixed #xxx / Gap #xxx

1. Currently we have a warning in our CI:

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

Testing Instructions:

1. none, will be tested in the CI.

• Doc added/updated
• Tests added