fix(segments): add migration to set version on existing segments

[matthewelwell]

Changes

Fixes issue introduced by #4138 where existing segments did not have a default version.

How did you test this code?

Ran the same query on the production database manually and verified that the issue was resolved.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Jul 9, 2024 10:45am
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Jul 9, 2024 10:45am
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Jul 9, 2024 10:45am

[github-actions]

flagsmith-frontend image build and security scan finished ✨

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ghcr.io/flagsmith/flagsmith-frontend:pr-4315	Finished ✅	Results ✅

[github-actions]

flagsmith-e2e image build finished ✨

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[github-actions]

flagsmith-private-cloud image build and security scan finished ✨

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4315	Finished ✅	Results ✅

[github-actions]

flagsmith image build and security scan finished ✨

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith:pr-4315	Finished ✅	Results ✅

[github-actions]

flagsmith-api image build and security scan finished ✨

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-api:pr-4315	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-53987 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.60%. Comparing base (007351c) to head (34ab39a).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4315   +/-   ##
=======================================
  Coverage   96.60%   96.60%           
=======================================
  Files        1195     1196    +1     
  Lines       39104    39113    +9     
=======================================
+ Hits        37778    37787    +9     
  Misses       1326     1326           

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