Fix deprecation of node12 actions

[miguelgfierro]

Description

We are getting some warnings that we need to update the node12 to node16 and that affects some commands in GitHub actions. See https://github.com/microsoft/recommenders/actions/runs/3442907860

Node.js 12 actions are deprecated. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/. Please update the following actions to use Node.js 16: actions/checkout@v2, actions/setup-python@v2

hopefully nothing breaks :-)

Related Issues

References

Checklist:

• I have followed the contribution guidelines and code style for this project.
• I have added tests covering my contributions.
• I have updated the documentation accordingly.
• This PR is being made to staging branch and not to main branch.

[miguelgfierro]

@simonzhaoms let's hope we are not breaking anything :-)