deps: update flagsmith-common 2.2.6

[matthewelwell]

Changes

Supersedes #6256 .

This PR bumps the flagsmith-common dependency from 2.2.4 to 2.2.6 to resolve issues introduced by the fix to remove temporary directories created for prometheus multiprocessing.

How did you test this code?

Tested in flagsmith-common repository and (hopefully) via green CI on this PR.

[vercel]

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored			Nov 11, 2025 10:23am
flagsmith-frontend-preview	Ignored			Nov 11, 2025 10:23am
flagsmith-frontend-staging	Ignored			Nov 11, 2025 10:23am

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6267	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6267	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6267	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-6267	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6267	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6267	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.02%. Comparing base (9085cb4) to head (17c29c0).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff            @@
##             main    #6267    +/-   ##
========================================
  Coverage   98.01%   98.02%            
========================================
  Files        1278     1280     +2     
  Lines       45183    45408   +225     
========================================
+ Hits        44285    44510   +225     
  Misses        898      898            

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