[SK-657] chore(deps): bump cffi >=1.15.1 → >=2.0.0

[dhawani]

Summary

Linear: SK-657

Bumps cffi minimum bound from >=1.15.1 to >=2.0.0.

Package	From	To	Risk
cffi	>=1.15.1	>=2.0.0	Medium (major version)

Why this is safe

• cryptography>=46.0.6 (already required by this SDK) hard-requires cffi 2.0+, meaning all current SDK consumers already have cffi 2.0.0 installed — this change makes the explicit constraint consistent with reality
• The SDK does not call any cffi API directly; cffi is only used transitively via cryptography
• cffi 2.0.0 only drops Python 2 support — this SDK requires Python 3

Test plan

• make lint passes (static compile check)
• make setup installs cleanly with cffi 2.0.0
• No cffi API calls in SDK source — zero code changes needed
• Integration tests require live SCALEKIT_ENV_URL credentials (pre-existing, unaffected)

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 8c061453-0042-45ae-93b7-418f2e62bd94

📥 Commits

Reviewing files that changed from the base of the PR and between 6945518 and f4930fd.

📒 Files selected for processing (1)

• setup.py

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/deps/SK-657-cffi-to-2.0.0

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[dhawani]

CI failure is pre-existing and unrelated to this PR.

The 3 failing tests are all in test_providers.py with TypeError: 'NoneType' object is not iterable in custom_provider.py:263 — caused by the live API returning fields: null in an AuthPattern, which the code doesn't guard against.

Evidence this predates our change: the last Build run on main itself (run 27404354042, commit 6945518) failed with errors=4 — the same test, one more error than our PR.

This PR only modifies setup.py to bump cffi minimum from >=1.15.1 to >=2.0.0. Since cryptography>=46.0.6 already hard-requires cffi 2.0+, this constraint change has zero behavioral impact on any code path.

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