🌿 Fern Regeneration -- April 4, 2026

[fern-api]

This PR regenerates code to match the latest API Definition.

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Note

Medium Risk
Medium risk due to the Python minimum version bump to 3.10 and changes to HTTP retry/client construction for async requests, which can affect runtime behavior under network failures.

Overview
Regenerates the Fern Python SDK to cohere v6.0.0, updating Fern CLI/generator versions and refreshing the dependency lockfile.

Raises the minimum supported Python version to 3.10 (project config + CI) and updates dev tooling (notably pytest/pytest-asyncio). Adds an optional aiohttp extra (aiohttp + httpx-aiohttp) plus new default async clients and CI coverage for aiohttp-marked tests.

Improves HTTP robustness by making retry behavior configurable via a base max-retries value and adding retries for connection/protocol errors (with exponential backoff). Updates async client initialization to optionally use httpx-aiohttp, and extends AsyncBaseCohere with an async_token hook for async token acquisition.

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