Lower compat bounds and downgrade tests

[gdalle]

Checklist

• [x] Appropriate tests were added
• [x] Any code changes were done in a way that does not break public API
• [x] All documentation related to code changes were updated
• [x] The new code follows the contributor guidelines, in particular the SciML Style Guide and COLPRAC.
• [x] Any new documentation only uses public API

Additional context

The compat bounds for ChainRulesCore and EnzymeCore were the most recent ones. I relaxed them to versions where I am sure that the necessary objects already exist, and added a downgrade compat test on Julia 1.10

[codecov[bot]]

Codecov Report

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

Project coverage is 100.00%. Comparing base (2e67bf3) to head (ca45982).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #45 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 6 6 Lines 64 64 ========================================= Hits 64 64 ```

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