deps: bump influxdb-client from 1.28.0 to 1.50.0 in /api

[khvn26]

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Changes

This helps to remove setuptools from runtime (see related CVE).

How did you test this code?

We're merging once CI passes.

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3 Skipped Deployments

Project	Deployment	Review	Updated (UTC)
docs	Ignored		Jan 26, 2026 9:25am
flagsmith-frontend-preview	Ignored		Jan 26, 2026 9:25am
flagsmith-frontend-staging	Ignored		Jan 26, 2026 9:25am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6593	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6593	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith:pr-6593	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6593	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6593	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6593	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.10%. Comparing base (9838589) to head (d3c9458).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6593      +/-   ##
==========================================
- Coverage   98.16%   98.10%   -0.07%     
==========================================
  Files        1295     1295              
  Lines       46793    46793              
==========================================
- Hits        45934    45905      -29     
- Misses        859      888      +29     

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