Update supported versions of nodejs in tests

[mrchrisadams]

Triage

Type of change

Please select any of the below items that are appropriate.

This pull request:

• Adds a new carbon estimation model to CO2.js
• Adds new functionality to an existing model
• Fixes a bug with an existing model implementation
• Add other new functionality to CO2.js
• Add new data to CO2.js
• Improves developer experience for contributors
• Adds contributors to CO2.js
• Does something not specified above

Related issue/s

Please list below any issues this pull request is related to.

Docs changes required

Do any changes made in this pull request require parts of the CO2.js documentation to be updated?

• Yes
• No
• I don't know

If you answered "Yes", please create an corresponding issue in our Developer Documentation repository.

Describe the changes made in this pull request

This pull request includes updates to the GitHub Actions workflow configuration for running unit tests. The changes primarily focus on updating the supported Node.js versions to ones that are inside Nodejs own support window, and updates the actions used in the workflow to use newer versions.

Previously we were running NodeJs on unsupported versions of node, and this was causing failing tests in PRs that shouldn't really have them. See #241 as an example of a PR with failing tests related to the use of Node 14.

Updates to GitHub Actions workflow:

• .github/workflows/unittests.yml: Removed support for the ca-v0.10.0 branch from both push and pull_request events.
• .github/workflows/unittests.yml: Updated the supported Node.js versions in the matrix strategy to 18.x, 20.x, and 22.x.
• .github/workflows/unittests.yml: Updated actions/checkout to version v4 and actions/setup-node to version v4.