deps: bump flagsmith-workflows to 3.1.0

[matthewelwell]

Changes

Bumps flagsmith-workflows to v3.1.0 primarily to improve the stale flags logic such that the stale tag gets created when it first encounters a stale flag in a project. See here for more details.

How did you test this code?

Tests were completed in the flagsmith-workflows repository.

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3 Skipped Deployments

Project	Deployment	Preview	Comments	Updated (UTC)
docs	Ignored			Oct 8, 2025 5:09pm
flagsmith-frontend-preview	Ignored			Oct 8, 2025 5:09pm
flagsmith-frontend-staging	Ignored			Oct 8, 2025 5:09pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6140	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api-test:pr-6140	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6140	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-frontend:pr-6140	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.99%. Comparing base (57f0e97) to head (c2f907f).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6140   +/-   ##
=======================================
  Coverage   97.99%   97.99%           
=======================================
  Files        1278     1278           
  Lines       44927    44927           
=======================================
  Hits        44028    44028           
  Misses        899      899           

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