Fix CI checks: update dependencies and resolve Pydantic V2.11 deprecations

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Summary

What does this PR do? Please provide a brief summary of the changes introduced.

• Bug fix
• New feature
• Documentation update
• Code quality / linting
• Other (please describe):

Description

CI checks were failing due to outdated lock file and Pydantic V2.11 deprecation warnings.

Changes

Dependency synchronization

• Updated uv.lock to resolve version drift across CI environments (Python 3.10, 3.11, 3.12)

Pydantic V2.11 compatibility

• Fixed deprecated self.model_fields → self.__class__.model_fields in:
  • base/trainer_config.py: __init__, __getattr__, __setattr__
  • fl_tasks/pytorch.py: __getattr__
  • fl_tasks/huggingface.py: __getattr__

Accessing model_fields from instances is deprecated in Pydantic V2.11. The fix maintains identical runtime behavior while eliminating 76 deprecation warnings.

Testing

Describe how you tested your changes. Include the steps to reproduce, commands run, and any relevant outputs.

• Unit tests added or updated
• All tests pass locally (make test)
• Code coverage maintained or improved

Checklist

Before submitting your PR, please check off the following:

• My code follows the existing style and conventions
• I've run linting (make lint)
• I've added/updated relevant documentation
• I've added/updated tests as needed
• I've verified integration with existing tools (HuggingFace, LlamaIndex, LangChain, etc. if applicable)
• I've added an entry to the CHANGELOG.md (if applicable)

Related Issues or PRs

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[codecov]

Codecov Report

❌ Patch coverage is 75.00000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 98.66%. Comparing base (a987fe6) to head (e0c1b38).

Files with missing lines	Patch %	Lines
src/fed_rag/base/trainer_config.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #526   +/-   ##
=======================================
  Coverage   98.66%   98.66%           
=======================================
  Files         156      156           
  Lines        4119     4119           
=======================================
  Hits         4064     4064           
  Misses         55       55           

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