fix(identit/models): update_traits typing to support dicts

[gagantrivedi]

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• [ ] I have added information to docs/ if required so people know about the feature!
• [x] I have filled in the "Changes" section below?
• [x] I have filled in the "How did you test this code" section below?
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Changes

The trait_value field in SDKTraitData now correctly accepts both:

• Structured SDKTraitValueData (from serializer validation via TraitValueField)
• Raw primitive values (str, int, bool, float) when called directly
• None (to delete traits)

This aligns the type definition with the actual runtime behavior of update_traits() and generate_traits() methods which handle both cases via Trait.generate_trait_value_data().

How did you test this code?

Please describe.

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored	Preview		Dec 5, 2025 7:35am
flagsmith-frontend-preview	Ignored	Preview		Dec 5, 2025 7:35am
flagsmith-frontend-staging	Ignored	Preview		Dec 5, 2025 7:35am

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Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api-test:pr-6371	Finished :white_check_mark:	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6371	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-api:pr-6371	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith:pr-6371	Finished :white_check_mark:	Results :white_check_mark:
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6371	Finished :white_check_mark:	Results :white_check_mark:

[codecov[bot]]

Codecov Report

:white_check_mark: All modified and coverable lines are covered by tests. :white_check_mark: Project coverage is 98.02%. Comparing base (a2b62f2) to head (1bfef76). :warning: Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6371   +/-   ##
=======================================
  Coverage   98.02%   98.02%           
=======================================
  Files        1282     1282           
  Lines       45498    45500    +2     
=======================================
+ Hits        44600    44602    +2     
  Misses        898      898           

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