fix: Remove warning about non-unique health namespace

[rolodato]

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Changes

Fixes a warning about non-unique namespaces, can be seen when API starts up:

WARNINGS:
?: (urls.W005) URL namespace 'health' isn't unique. You may not be able to reverse all URLs in this namespace

Forgot to add this before merging #4340

How did you test this code?

python manage.py runserver, warning is no longer there

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)			Aug 12, 2024 2:21pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)			Aug 12, 2024 2:21pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)			Aug 12, 2024 2:21pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4479	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-4479	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4479	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4479	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-4479	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4479	Finished ✅	Results ✅

[github-actions]

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