Remove lib2to3

[Avasam]

lib2to3 is no longer provided with Python 3.13: https://peps.python.org/pep-0594/#deprecated-modules But it's also redundant here.

See the following test:
python -c "from setuptestframework import makeadopackage; makeadopackage('test_folder')":
Before: with_2_to_3.zip
This PR: plain.zip

The only changes are:

• Naive addition of extra parentheses around print arguments
• lib2to3 actually breaks annotations by removing from __future__ import annotations
• dict.items() is redundantly wrapped in a list (probably to avoid issues with single-use iterators)
• Redundant type tuple in isinstance is simplified (good catch lib2to3, I've added this source code cleanup to adodbapi: Cleanup obsolete and unsupported python code #2094 )

Additionally, I changed os.mkdir to os.makedirs (which creates folders recursively) so that you don't have to manually create the test folder first (it would still fail if it already exists)