fix(sentry-FLAGSMITH-API-4FZ): fix PATCH for segments

[gagantrivedi]

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Changes

fix broken PATCH request to segments

How did you test this code?

Adds a unit test

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[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: api/segments/serializers.py

Function	Unhandled Issue
validate	AttributeError: 'NoneType' object has no attribute 'organisation' /api/v1/projects/{project_p... Event Count: 7

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[github-actions]

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.41%. Comparing base (50cc369) to head (13d44fd).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4029   +/-   ##
=======================================
  Coverage   96.41%   96.41%           
=======================================
  Files        1145     1145           
  Lines       37295    37302    +7     
=======================================
+ Hits        35959    35966    +7     
  Misses       1336     1336           

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