Increase lower compat with ADTypes

[fhagemann]

The current version of AutoDiffOperators imports AutoFiniteDifferences and AutoEnzyme.

AutoEnzyme was introduced in [email protected] and AutoFiniteDifferences was introduced in [email protected].
Therefore, the support for [email protected] should be dropped.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.51%. Comparing base (a545b54) to head (1c8a4a2).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #25   +/-   ##
=======================================
  Coverage   68.51%   68.51%           
=======================================
  Files          13       13           
  Lines         289      289           
=======================================
  Hits          198      198           
  Misses         91       91           

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[oschulz]

Thanks!