ENH: future-proof changing signature in format() and format_exception_only()

[mattip]

Things to check first

• I have searched the existing issues and didn't find my feature already requested there

Feature description

Currently, PatchedTracebackException overrides the stdlib TracebackException implementation of format and format_exception_only. With the new pyrepl coming in python3.13, the signatures of those methods changes: they get an additional kwarg colorize. In PyPy we would like to backport that pure-python pyrepl to our python3.10 implementation, but then the overrides' signatures are wrong. Adding **kwargs would future-proof the overrides, at the cost of loosing the nice colorization of tracebacks.

Use case

This came up in pypy/pypy#5004, where pytest collection suddenly started failing. There may be other cases for using exceptiongroups on Python implementations and versions that change the signatures of the overriden functions.

[agronholm]

Hm, I looked at the signatures of the stdlib counterparts and, to my surprise, they too had **kwargs there. I'm working on a PR to address this, but I'm getting test failures to do the exception note being present in the output twice. I'll post the PR as soon as I've resolved this.

[agronholm]

Ok, that was just the result of a wrong key combination somewhere down the line which duplicate a yield statement. Fixed. The PR is up for review.