fix: set minimum pydantic version to 2.11 to avoid model_fields depreciations

[himax12]

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• Updated pydantic dependency constraints to require minimum version 2.11
• Pydantic v2.11+ deprecated accessing model_fields on instances
• Will be removed in Pydantic v3.0
• Updated in: tracking-client, tracking-server, pydantic extra, and tests dependencies
• All 32 pydantic integration tests pass

[Short description explaining the high-level reason for the pull request]

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Checklist

• PR has an informative and human-readable title (this will be pulled into the release notes)
• Changes are limited to a single goal (no scope creep)
• Code passed the pre-commit check & code is left cleaner/nicer than when first encountered.
• Any change in functionality is tested
• New functions are documented (with a description, list of inputs, and expected output)
• Placeholder code is flagged / future TODOs are captured in comments
• Project documentation has been updated if adding/changing functionality.

[Copilot]

Pull request overview

This PR updates optional dependency constraints in pyproject.toml to require Pydantic v2.11+ in order to address model_fields deprecation behavior referenced in the PR description.

Changes:

• Bump tests optional dependency to pydantic[email]>=2.11.
• Bump tracking-client, tracking-server, and pydantic optional dependency groups to pydantic>=2.11.

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