fix(Hubspot): Fix unexpected setuptools dependency

[emyller]

Changes

Closes #6791

Upgrade python-hubspot-client from 8.x to 12.x.

This is a hotfix that attempts to move the ball forward rather than reinstate setuptools back as a core dependency.

How did you test this code?

• Used AI to collect data on our SDK usage vs the python-hubspot-client CHANGELOG since 8.x, and got convinced no changes are relevant to our use.
• Ran tests relevant to this integration locally. All pass.

python-hubspot-client CHANGELOG highlights (according to Claude):

• 9.0.0: Association object IDs changed from int to str (we already use str).
• 9.0.0: auth.oauth client moved to oauth (we use access token auth).
• 10.0.0: All GDPR and PublicObject APIs removed (we don't use them).
• 12.0.0: BatchInputSimplePublicObjectInputForCreate renamed (we use the single variant).
• 12.0.0: object_write_trace_id removed from input models (we don't set it).
• 12.0.0: pkg_resources replaced with importlib.metadata — this is the actual fix we need.

[vercel]

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3 Skipped Deployments

Project	Deployment	Actions	Updated (UTC)
docs	Ignored		Feb 26, 2026 6:18pm
flagsmith-frontend-preview	Ignored		Feb 26, 2026 6:18pm
flagsmith-frontend-staging	Ignored		Feb 26, 2026 6:18pm

[github-actions]

Docker builds report

Image	Build Status	Security report
ghcr.io/flagsmith/flagsmith-e2e:pr-6793	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-frontend:pr-6793	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-api-test:pr-6793	Finished ✅	Skipped
ghcr.io/flagsmith/flagsmith-api:pr-6793	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith:pr-6793	Finished ✅	Results ✅
ghcr.io/flagsmith/flagsmith-private-cloud:pr-6793	Finished ✅	Results ✅

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.30%. Comparing base (5df4fe9) to head (697f94d).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #6793   +/-   ##
=======================================
  Coverage   98.30%   98.30%           
=======================================
  Files        1331     1331           
  Lines       49332    49332           
=======================================
  Hits        48494    48494           
  Misses        838      838           

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