chore(docker): Upgrade Python to the latest version

[fviernau]

This prepares for supporting Python version 3.11.

Note: This is done in a separate (from supporting python 3.11 with Pip) PR in order to show that the existing PoetryFunTest does not break for the currently used Python version 3.10, when poetry is run under version 3.11.

[codecov]

Codecov Report

All modified lines are covered by tests ✅

Comparison is base (7e3de27) 68.03% compared to head (6dac18d) 68.03%.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #7599   +/-   ##
=========================================
  Coverage     68.03%   68.03%           
  Complexity     2022     2022           
=========================================
  Files           344      344           
  Lines         16723    16723           
  Branches       2370     2370           
=========================================
  Hits          11377    11377           
  Misses         4363     4363           
  Partials        983      983           

Flag	Coverage Δ
funTest-docker	69.40% <ø> (ø)
funTest-non-docker	36.44% <ø> (ø)
test	35.53% <ø> (ø)

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[fviernau]

I'm not sure if this is needed for supporting Python 3.11 with Pip / Poetry (#7598). I cannot see any indication of need from the tests of that PR. Should we still upgrade Python now, or defer it a bit?

[sschuberth]

Should we still upgrade Python now, or defer it a bit?

I don't have an opinion here as I rarely analyze Python projects. What about @oss-review-toolkit/core-devs?

[heliocastro]

Why not give proper instructions how to install multiple pythons with custom docker and done ?
This can be done on documentation. We already have cases on TNG where i was asked how to have two pythons inside the env.
There's honestly nothing forcing to make 3.11.x default unless we want to have headaches, but in other side, 3.12.x is already banging the door.

[sschuberth]

Why not give proper instructions how to install multiple pythons with custom docker and done ?

To me, bumping the default Python version here simple severs as a proof that our functional tests still pass with that version. It's not exclusively / primarily for convenience of our users.

[fviernau]

If one looks at EOL chart, we could establish ORT policy to always support the latest Python version in active support.
In the 3.11 case this will make the analysis work for 3.10 in most of the cases. In cases where it doesn't work (in particular for < 3.10 version, the user has to create a contain with also these Python versions installed to make it work).

So, I vote for a merge.

[1] https://endoflife.date/python