Upgrade GitHub Actions

[cclauss]

-        uses: actions/checkout@v3
-        uses: actions/setup-node@v3
+        uses: actions/checkout@v4
+        uses: actions/setup-node@v4

• https://github.com/actions/checkout/releases
• https://github.com/actions/setup-node/releases

Description

Motivation and Context

issue

How Has This Been Tested?

https://github.com/BrainJS/brain.js/actions

Screenshots (if appropriate):

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)

Author's Checklist:

• My code focuses on the main motivation and avoids scope creep.
• My code passes current tests and adds new tests where possible.
• My code is SOLID and DRY.
• I have updated the documentation as needed.

Reviewer's Checklist:

• I kept my comments to the author positive, specific, and productive.
• I tested the code and didn't find any new problems.
• I think the motivation is good for the project.
• I think the code works to satisfies the motivation.

[cclauss]

Closed in favor of #945 which automates the creation of pull requests like this.

• Keep GitHub Actions up to date with GitHub's Dependabot #945