Fix deprecation warnings around "copy_on_model_validation"

[Dominic-Walther]

Reduces Pytest warnings from 6145 down to 4.

[codecov]

Codecov Report

Base: 100.00% // Head: 100.00% // No change to project coverage 👍

Coverage data is based on head (10a1d35) compared to base (e9b6edf).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@             Coverage Diff             @@
##            master      #927     +/-   ##
===========================================
  Coverage   100.00%   100.00%             
===========================================
  Files           11        14      +3     
  Lines         1020      2082   +1062     
  Branches       201       517    +316     
===========================================
+ Hits          1020      2082   +1062     

Flag	Coverage Δ
unittests	100.00% <100.00%> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
datamodel_code_generator/__main__.py	100.00% <100.00%> (ø)
datamodel_code_generator/http.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/base.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/enum.py	100.00% <100.00%> (ø)
...amodel_code_generator/model/pydantic/base_model.py	100.00% <100.00%> (ø)
..._code_generator/model/pydantic/custom_root_type.py	100.00% <100.00%> (ø)
...tamodel_code_generator/model/pydantic/dataclass.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/pydantic/imports.py	100.00% <100.00%> (ø)
datamodel_code_generator/model/pydantic/types.py	100.00% <100.00%> (ø)
datamodel_code_generator/parser/base.py	100.00% <100.00%> (ø)
... and 7 more

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[koxudaxi]

@Dominic-Walther
Thank you for creating the PR.
I guess the braking changes came from the PR.
pydantic/pydantic#4093

We should change the value by the pydantic version.

[Dominic-Walther]

Good catch.
Would be great to have an automatic check to verify compatibility with older versions of dependencies, as my commit would have likely broken something, despite passing all tests. Checking all possible version combinations would lead to exponential (if not factorial) growth in the number of required tests, so it's probably best to just check the oldest supported version of all direct dependencies. I'm not aware of a simple way of doing this however - maybe a poetry plugin? (Related issues: pypa/flit#396, pdm-project/pdm#906)

[koxudaxi]

I agree with you.
We should check the oldest dependence.
I want to avoid a lot of unit test on CI 😓