Changelog and pytest with 3.12

[tobin-ford]

Describe your changes

Update changelog, combine dispirate whatsnew entries into a single version. Increase pytest coverage to include python 3.12

Type of change

Please delete options that are not relevant.

• [x] New feature (non-breaking change which adds functionality)
• [x] This change requires a documentation update

Checklist before requesting a review

• [x] What's new changelog has been updated in the docs

[codecov-commenter]

Codecov Report

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

Project coverage is 64.95%. Comparing base (9dc106b) to head (53651cd).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## development #110 +/- ## ============================================ Coverage 64.95% 64.95% ============================================ Files 34 34 Lines 3242 3242 ============================================ Hits 2106 2106 Misses 1136 1136 ```

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