fix loading layers with lambda in from .h5 files #19151

[alanwilter]

This fixes the issue #19151 but I'm not sure where/how to add a test unit for this.

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[fchollet]

Thanks for the PR!

I'm not sure where/how to add a test unit for this.

It should be in keras/saving/saving_lib_test.py

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 76.08%. Comparing base (e62b2d6) to head (c00d57b).
Report is 18 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #19438      +/-   ##
==========================================
- Coverage   76.09%   76.08%   -0.02%     
==========================================
  Files         367      367              
  Lines       41055    41055              
  Branches     8014     8014              
==========================================
- Hits        31241    31235       -6     
- Misses       8099     8103       +4     
- Partials     1715     1717       +2     

Flag	Coverage Δ
keras	75.93% <100.00%> (-0.02%)	⬇️
keras-jax	60.19% <100.00%> (ø)
keras-numpy	54.12% <100.00%> (ø)
keras-tensorflow	61.41% <100.00%> (-0.02%)	⬇️
keras-torch	60.30% <100.00%> (ø)

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[alanwilter]

The failing tests don't seem to have any relation with the PR here:

=========================== short test summary info ============================
FAILED keras/ops/numpy_test.py::NumpyTwoInputOpsCorretnessTest::test_quantile
FAILED keras/ops/numpy_test.py::NumpyOneInputOpsCorrectnessTest::test_median
====== 2 failed, 9542 passed, 289 skipped, 1 xfailed in 556.03s (0:09:16) ======