deps: add licensing to private installation

[matthewelwell]

Changes

Adds licensing to private dependency installation

How did you test this code?

Verified that the following command installs the licensing package.

poetry install --with licensing

The images built as part of this PR should also confirm that the Dockerfile change works.

[vercel]

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3 Skipped Deployments

Name	Status	Preview	Comments	Updated (UTC)
docs	⬜️ Ignored (Inspect)	Visit Preview		Jan 2, 2025 3:22pm
flagsmith-frontend-preview	⬜️ Ignored (Inspect)	Visit Preview		Jan 2, 2025 3:22pm
flagsmith-frontend-staging	⬜️ Ignored (Inspect)	Visit Preview		Jan 2, 2025 3:22pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-4947	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-4947	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api:pr-4947	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-4947	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith:pr-4947	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-4947	Finished ✅	Results ✅

[github-actions]

Uffizzi Preview deployment-59445 was deleted.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 97.39%. Comparing base (95ebbdf) to head (8344a9f).
Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #4947   +/-   ##
=======================================
  Coverage   97.39%   97.39%           
=======================================
  Files        1191     1191           
  Lines       41552    41552           
=======================================
  Hits        40470    40470           
  Misses       1082     1082           

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