python: interpreter package not reproducible

[raboof]

Building the python interpreter twice does not produce the bit-by-bit identical result each time, making it harder to detect CI breaches.

For more background on the cause(s) of this problem, see #120858 and further resources linked there.

Notably, the remaining known upstream issue (python/cpython#81777) has been fixed in Python 3.11, so we should verify the problem remains after bumping the default python version to 3.11.

Anecdotally, on nixpkgs 6512b21 nix-build --check '<nixpkgs>' -A python311 indeed succeeded for me, which is promising.

[raboof]

python 3.11 is planned to become the default on unstable after the release of 23.05, following https://github.com/NixOS/nixpkgs/blob/master/doc/languages-frameworks/python.section.md#cpython-update-schedule.

There might be other remaining issues in python though, e.g. python/cpython#78274

[raboof]

python 3.11 is planned to become the default on unstable after the release of 23.05

This is now on its way in #251878 / https://nixpk.gs/pr-tracker.html?pr=251878