Update to Python ≥3.12 by October 2025

[namurphy]

This environment is currently based in Python 3.11. Several PyHC packages (e.g., SunPy and PlasmaPy) and important dependencies (e.g., NumPy) generally follow the recommendations in SPEC 0, and are expected to drop Python 3.11 support for releases made after ∼October 2025. This environment would need to be updated to Python ≥3.12 before then in order to include the most recent releases of these packages after then.

A caveat is that this would exclude packages that don't run on Python 3.12+ by then, so it would likely help to work with the developers of those packages to enable interoperability with Python 3.12+.

[sapols]

Thanks for this reminder, @namurphy!