What is the problem this feature will solve?

In a few recent PRs, it would have been handy to just rely on python >=3.11 feature (#16886 -- Exception.add_note, #16892 -- warnings.catch_warnings(action=..., category=...). Since by the time of 7.0, we should be dropping support for python 3.10 anyway, how about going ahead and do that in .dev now?

Describe the desired outcome

Less work-arounds.

Additional context

https://scientific-python.org/specs/spec-0000/#2024---quarter-4, drop support for

python 3.10 released Oct 2021