chore(deps): update dependency google-genai to v1.66.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-genai	1.64.0 → 1.66.0

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Release Notes

googleapis/python-genai (google-genai)

v1.66.0

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Features

• Add gemini-3.1-flash-image-preview model (dd52cc2)
• Support signature for all Interaction tool types (abb388e)
• Update data types from discovery doc. (15666c0)

v1.65.0

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Features

• Add gemini-3.1-pro-preview to list of models in Interactions (fe86870)
• Add Image Grounding support to GoogleSearch tool (0035182)
• Enable server side MCP and disable all other AFC when server side MCP is configured. (4dd7b16)
• Support more image sizes and resolutions (8b2a4e0)

Bug Fixes

• Change interactions media mime type to enum (breaking change for experimental feature) (e0f3378)
• Handle non-list response_stream in HttpResponse.json property (006042d)
• Handle non-list response_stream in HttpResponse.json property (#​1903) (61aec34)
• Make aiohttp an optional dependency, bump aiohttp version upperbound, and ensure HttpOptions.async_client_args propagates to custom aiohttp.ClientSession request args for proxy etc. (b28d144), closes #​2090 #​2051 #​1950

Documentation

• Regenerate docs for 1.64.0 (a023141)
• Update README and codegen_instructions for structured outputs (4d5a978)

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