Enable session's Python version display in the output of --list

[paduszyk]

How would this feature be useful?

Having a session using different versions of Python, it would be nice (as I think, of course 😄) to have those printed by nox --list.

For example, for a session like this:

@nox.session(python=["3.9", "3.10", "3.11"])
def tests(session):
    """Run tests."""
    pass

printing the list result in:

- tests-3.9 -> Run tests.
- tests-3.10 -> Run tests.
- tests-3.11 -> Run tests.

Desired output would be:

- tests-3.9 -> Run tests (Python 3.9).
- tests-3.10 -> Run tests (Python 3.10).
- tests-3.11 -> Run tests (Python 3.11).

In tox, the solution was quite easy as one could interpolate env description using {basepython} variable.

Describe the solution you'd like

I think it's quite easy to implement. Updated must be:

https://github.com/paduszyk/nox/blob/274df9be1b977d7f4a6323f2dcb7ace6e49bf0bd/nox/sessions.py#L712-L718

Let me know if it makes sense. If so, I think I can open the respective PR.

Describe alternatives you've considered

No response

Anything else?

No response