Warning on GitHub Actions

This is a reminder to deal with the warnings raised in our CICD flow, which seem to be mostly these:

run_tests / run_tests (windows-latest, 3.9) Node.js 12 actions are deprecated. Please update the following actions to use Node.js 16: coverallsapp/github-action@master. For more information see: https://github.blog/changelog/2022-09-22-github-actions-all-actions-will-begin-running-on-node16-instead-of-node12/.

run_tests / run_tests (macos-latest, 3.10) The set-output command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/