Disable loading functions within deserialization.

[hertschuh]

Loading files while loading a model is not allowed.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 82.72%. Comparing base (e4bca84) to head (12bbc23).
Report is 7 commits behind head on master.

Files with missing lines	Patch %	Lines
keras/src/saving/serialization_lib.py	50.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master   #21412      +/-   ##
==========================================
+ Coverage   82.67%   82.72%   +0.04%     
==========================================
  Files         565      565              
  Lines       55064    55222     +158     
  Branches     8569     8609      +40     
==========================================
+ Hits        45525    45683     +158     
+ Misses       7441     7428      -13     
- Partials     2098     2111      +13     

Flag	Coverage Δ
keras	82.53% <50.00%> (+0.05%)	⬆️
keras-jax	63.33% <50.00%> (-0.18%)	⬇️
keras-numpy	58.53% <50.00%> (-0.15%)	⬇️
keras-openvino	33.79% <50.00%> (+0.33%)	⬆️
keras-tensorflow	63.74% <50.00%> (-0.17%)	⬇️
keras-torch	63.37% <50.00%> (-0.17%)	⬇️

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[mattdangerw]

Thanks!