deps: bump flagsmith-common from 3.8.2 to 3.9.0 in /api

[gagantrivedi]

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• I have filled in the "Changes" section below.
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Changes

Contributes to

Bumps flagsmith-common from 3.8.2 to 3.9.0.

• Updates the lower bound of the version constraint in api/pyproject.toml from >=3.8.2,<4 to >=3.9.0,<4.
• Refreshes api/poetry.lock so the resolved version is 3.9.0.

How did you test this code?

• poetry lock resolved cleanly with the new constraint and produced a valid lockfile pinning flagsmith-common==3.9.0.
• Relying on CI for the full test, type check, and lint suites.

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		May 1, 2026 11:07am
flagsmith-frontend-preview	Ignored		May 1, 2026 11:07am
flagsmith-frontend-staging	Ignored		May 1, 2026 11:07am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-7389	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-7389	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-7389	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-7389	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-7389	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-7389	Finished ✅	Results ✅

[github-actions]

Visual Regression

16 screenshots compared. See report for details.
View full report

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.44%. Comparing base (413c9b8) to head (e800585).
⚠️ Report is 9 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7389   +/-   ##
=======================================
  Coverage   98.44%   98.44%           
=======================================
  Files        1398     1398           
  Lines       52628    52628           
=======================================
  Hits        51808    51808           
  Misses        820      820           

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[github-actions]

Playwright Test Results (oss - depot-ubuntu-latest-16)

 11 passed

Details

 11 tests across 8 suites
 24 seconds
 e800585
 🔄 Run: #16494 (attempt 4)

Playwright Test Results (oss - depot-ubuntu-latest-arm-16)

 11 passed

Details

 11 tests across 8 suites
 28.9 seconds
 e800585
 🔄 Run: #16494 (attempt 4)

Playwright Test Results (private-cloud - depot-ubuntu-latest-arm-16)

 17 passed

Details

 17 tests across 14 suites
 1 minute, 4 seconds
 e800585
 🔄 Run: #16494 (attempt 4)

Playwright Test Results (private-cloud - depot-ubuntu-latest-16)

 2 passed

Details

 2 tests across 2 suites
 51 seconds
 e800585
 🔄 Run: #16494 (attempt 4)