Unpin pydantic

[larsevj]

Issue
Resolves #9292

• PR title captures the intent of the changes, and is fitting for release notes.
• Added appropriate release note label
• Commit history is consistent and clean, in line with the contribution guidelines.
• Make sure unit tests pass locally after every commit (git rebase -i main --exec 'pytest tests/ert/unit_tests -n logical -m "not integration_test"')

When applicable

• When there are user facing changes: Updated documentation
• New behavior or changes to existing untested code: Ensured that unit tests are added (See Ground Rules).
• Large PR: Prepare changes in small commits for more convenient review
• Bug fix: Add regression test for the bug
• Bug fix: Create Backport PR to latest release

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 91.86%. Comparing base (0e19012) to head (57c5943).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9514      +/-   ##
==========================================
- Coverage   91.87%   91.86%   -0.01%     
==========================================
  Files         433      433              
  Lines       26770    26771       +1     
==========================================
- Hits        24595    24594       -1     
- Misses       2175     2177       +2     

Flag	Coverage Δ
cli-tests	39.76% <100.00%> (+<0.01%)	⬆️
everest-models-test	34.65% <100.00%> (-0.01%)	⬇️
gui-tests	72.14% <100.00%> (+<0.01%)	⬆️
integration-test	37.20% <100.00%> (-0.01%)	⬇️
performance-tests	51.94% <100.00%> (+<0.01%)	⬆️
test	40.45% <100.00%> (+<0.01%)	⬆️
unit-tests	74.16% <100.00%> (-0.01%)	⬇️

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[codspeed-hq]

CodSpeed Performance Report

Merging #9514 will not alter performance

_{Comparing larsevj:unpin_pydantic_210 (57c5943) with main (0e19012)}

Summary

✅ 22 untouched benchmarks

[oyvindeide]

Lets merge this, but we agreed to create an issue to figure out the root cause.