(chore) O3-3551: Use actions/checkout@v4 in GH actions

[Bcoderx6]

https://openmrs.atlassian.net/browse/O3-3551

This update improves our CI pipeline by upgrading actions/checkout from v2 to v4, using Node.js 16 instead of Node.js 12. This change boosts performance and security. The updated workflow has been tested and works without errors. @jayasanka-sack

[jayasanka-sack]

Thanks for the PR, @Bcoderx6!

General advice: When working on a PR, it's always best to create a new branch. Naming the branch with the relevant ticket number can help you keep track of your work. This allows you to:

1. work on multiple PRs simultaneously
2. prevent the inclusion of older commits, as seen in this PR (which contains 8 outdated commits).

[jayasanka-sack]

Also, can you update the PR title with the ticket number and the keyword? You can find a list of best practices here: https://o3-docs.openmrs.org/docs/frontend-modules/contributing.en-US#pull-requests

[Bcoderx6]

Thanks for the feedback, @jayasanka-sack !

For future PRs, I'll ensure to create a new branch named with the relevant ticket number to keep track of my work. This will help in managing multiple PRs simultaneously and prevent including outdated commits.

I'll update the PR title with the ticket number and keyword as suggested. For best practices, I'll refer to the guidelines at OpenMRS Contributing Guide.

[jayasanka-sack]

Thanks @Bcoderx6 !