Bump Python version requirement

[notpeelz]

The code currently uses features that aren't compatible with older python versions. Here's a non-exhaustive list of things pylance reports:

• (3.8) shlex.join: https://docs.python.org/3.8/library/shlex.html#shlex.join
• (3.9) argparse exit_on_error attr: https://docs.python.org/3.9/library/argparse.html?highlight=exit_on_error#argumentparser-objects
• (3.9) str.removeprefix: https://docs.python.org/3.9/library/stdtypes.html#str.removeprefix
• (3.9) dict union operator: https://peps.python.org/pep-0584/
• (3.10) typing union type expression: https://docs.python.org/3.10/library/typing.html#typing.Union

This version bump means officially dropping support for older debian/ubuntu LTS releases. Ubuntu 22.04 (jammy jellyfish) ships Python 3.10: https://discourse.ubuntu.com/t/jammy-jellyfish-release-notes/24668 Debian 12 (bookworm) ships Python 3.11: https://packages.debian.org/bookworm/python3

[Vladimir-csp]

I have nothing against it in general, but stdStream isn't used anymore, as no function defines streams as parameters. Is typing union the only thing that requires 3.10?

[notpeelz]

There's also traceback.print_exception(exception). With Python <=3.9, the signature is traceback.print_exception(etype, value, tb): https://docs.python.org/3.10/library/traceback.html#traceback.print_exception

[notpeelz]

I'll remove the revert commit and let you clean up the dead code.

[Vladimir-csp]

On second thought I do not want to mess with traceback.print_exception() )