fix: prevent lock when adding FFAdmin.uuid column

[matthewelwell]

Changes

Prevents needing a lock when adding the uuid field to the user model.

How did you test this code?

Ran python manage.py sqlmigrate users 0037 to ensure that the resultant behaviour is still what we expect.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Nov 12, 2024 4:41pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Nov 12, 2024 4:41pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Nov 12, 2024 4:41pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4832	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4832	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4832	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4832	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4832	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-58198 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.33%. Comparing base (cbd60d9) to head (86d73b4).
Report is 7 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4832   +/-   ##
=======================================
  Coverage   97.33%   97.33%           
=======================================
  Files        1180     1180           
  Lines       41231    41231           
=======================================
  Hits        40131    40131           
  Misses       1100     1100           

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