Lower compat bounds and downgrade tests

[gdalle]

Checklist

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

Codecov Report

All modified and coverable lines are covered by tests ✅

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

Additional details and impacted files

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

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