print_exception: rewrite deprecated code

[anki-code]

We have this line:

xonsh/xonsh/tools.py

Lines 1056 to 1058 in 55b341d

	sys.last_type, sys.last_value, sys.last_traceback = exc_info

But https://docs.python.org/3/library/sys.html:

These three variables are deprecated;
sys.last_type
sys.last_value
sys.last_traceback
Use sys.last_exc instead. They hold the legacy representation of sys.last_exc, as returned from exc_info() above.

We also have related issue with this code: #5408

For community

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[kulkarniniraj]

I have a fix ready but can't test it. python xonsh-in-docker.py gives me error that xonsh:latest cannot be pulled.

[anki-code]

hi @kulkarniniraj! That's cool! PR is welcome! Try docker run --rm -it xonsh/xonsh:slim xonsh or use xonsh-install to install xonsh in isolated environment.

[kulkarniniraj]

Thanks @anki-code. Turns out problem was with python 3.6. Once I passed 3.12 to xonsh-in-docker.py, it built docker image.