add gemini-3.5-flash to gemini computer use

[NikhilShahi]

Summary

Changes

Validation

• ruff check
• pytest

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Note

Low Risk
Additive Literal member and patch version bump only; no runtime logic changes.

Overview
Adds gemini-3.5-flash to the GeminiComputerUseLlm type alias in consts.py, so callers can pass that model when starting Gemini Computer Use tasks (e.g. via StartGeminiComputerUseTaskParams.llm).

Bumps the package version from 0.92.0 to 0.92.1 in pyproject.toml.

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