Fix CI

[mplough-kobold]

This PR gets CI passing on all platforms.

• Action versions have been upgraded.
  • conda-incubator/setup-miniconda@v3. Version 3.0.4 of that action addresses the issue that runners no longer provide miniconda by default.
  • actions/checkout@v4, codecov/codecov-action@v4. Version 2 ran on node.js 12 which is no longer available in GitHub Actions.
• Python 3.7 is dropped and the minimum version of scipy is bumped to 1.8. This matches SimPEG's supported versions. I also added CI runs on Python 3.11, which pass nicely with no special modifications.
• MacOS runners are constrained to macOS-13. The macOS-latest runner is now Apple Silicon, which means that the pardiso solver can no longer be used on those runners. We'll want to get MUMPS working for macOS eventually; that effort is already in progress over in #43.
• packaging is added as a dependency so we can check which version of scipy is in use; this allows the BicgJacobi iterative solver to be compatible with versions of scipy that include the old tol and new rtol kwarg names.

Fixes #45.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 89.36%. Comparing base (3eedc9d) to head (d79d979). Report is 20 commits behind head on main.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #46 +/- ## ========================================== + Coverage 89.26% 89.36% +0.10% ========================================== Files 5 5 Lines 298 301 +3 ========================================== + Hits 266 269 +3 Misses 32 32 ```

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