Update Node.js version to 20.x in build workflow

[david-poindexter]

Related to Issue

Resolves #381

Description

Bumps node version to 20.x for the GitHub Actions build.

How Has This Been Tested?

Merging this PR will allow for it to be tested.

Screenshots (if appropriate):

n/a

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)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.