Enzyme: bump version and mark models as working [test]

[wsmoses]

The underlying issue from GRU was fixed on Enzyme main recently (EnzymeAD/Enzyme.jl#1261).

Seeing if they now pass CI here (conv untested, but let's see what happens).

Bumping Enzyme to later version

[wsmoses]

@jgreener64 @CarloLucibello

[ToucheSir]

I'm still seeing test failures which look Enzyme related, are those expected?

[wsmoses]

@ToucheSir mind giving it a re-review. I now expect the only non-supported test is convtranspose, which should be fixed by FluxML/NNlib.jl#582.

Nevertheless enabling that test can be in a subsequent PR.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.10%. Comparing base (c442f0c) to head (504ac85).
Report is 2 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #2439       +/-   ##
===========================================
+ Coverage   46.37%   74.10%   +27.72%     
===========================================
  Files          32       32               
  Lines        1876     1923       +47     
===========================================
+ Hits          870     1425      +555     
+ Misses       1006      498      -508     

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