[OPS] Update Github actions from Node v16 dependency to Node v20

[oshoma]

PROBLEM
Our github actions rely on Node16, which is deprecated. As a result, the following warning is showing up in workflow action results:

tests

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-python@v4. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

SOLUTION
Update all of our github actions files as follows:

• use actions/checkout@v4 instead of v3 (see https://github.com/actions/checkout)
• use actions/setup-python@v5 instead of v4 (see https://github.com/actions/setup-python)

DEADLINE

Github says "Our plan is to transition all actions to run on Node 20 by Spring 2024."

https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/

[oshoma]

Thanks @saminegash for the fix

[oshoma]

Closed with #349