Update setuptools to address CVE-2026-59890

The latest released `airbyte-cdk` (7.25.1) and current `main` constrain `setuptools` to `^80.9.0`, while CVE-2026-59890 is fixed in 83.0.0. Downstream connectors cannot override this because Poetry reports an unsatisfiable constraint.

Please widen/update the CDK constraint to include `setuptools >=83.0.0` and publish a release so downstream lockfiles can remediate the vulnerability.

Trivy 0.74.0 reports this as MEDIUM with fixed version 83.0.0.

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**Internal Tracking:** https://github.com/airbytehq/oncall/issues/13315

Locate the Poetry dependency declaration that constrains setuptools in the CDK, then inspect how the current main branch and release configuration represent that constraint. Update it to include version 83.0.0 or newer, verify downstream lockfiles can resolve the fixed version, and publish a release as requested.

Written by the indexing model from the issue text.