[Tutor] python update

[Eryk Sun]

On 1/15/22, Mats Wichmann <mats at wichmann.us> wrote:
>
> New minor versions happen only once a year.  Micro versions are roughly
> every 2-3 months, depending on whether an important problem accelerates
> the cadence.

While the version number of a release is major.minor.micro, 3.x is
commonly referred to as a "major" version of Python 3.

See PEP 602 -- Annual Release Cycle for Python:

https://www.python.org/dev/peps/pep-0602