CI: Update actions

[ZedThree]

Several issues:

• There's a separate workflow for the master branch -- can this just be merged into the main action?
• Master and publish workflows still run on Py3.7
• Publish workflow runs tests -- presumably at the point of making a new release, we've already run tests?
• Publish workflow should use build package instead of running setup.py
• Publish workflow should probably use API token instead of PYPI_PASSWORD
• black workflow is just check, but could be switched to auto-commit
• Various actions need versions bumping:

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, actions/setup-python, codecov/codecov-action, actions/checkout

[dschwoerer]

* Publish workflow should probably use API token instead of PYPI_PASSWORD

I would assume PYPI_PASSWORD is already an API token?

* `black` workflow is just check, but could be switched to auto-commit

That would be great :+1: