Update Google ADK Gemini model in README

[pranavjana]

Summary

• update Google ADK README examples to use gemini-3.5-flash
• bump tinyfish-adk to 0.1.2 so the updated README can publish to PyPI

Testing

• not run; docs/version-only change

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: 7d992fbc-66ac-48ab-a896-ea15b3f1ef2b

📥 Commits

Reviewing files that changed from the base of the PR and between 1e2c77f and 87db6b3.

📒 Files selected for processing (2)

• google-adk/README.md
• google-adk/pyproject.toml

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📝 Walkthrough

Walkthrough

This PR updates the Google ADK package to use the gemini-3.5-flash model. Three documentation examples in the README (basic agent, async workflow, and all tools) are updated to reference the newer model instead of gemini-2.5-flash. The package version is simultaneously incremented from 0.1.1 to 0.1.2 in the project configuration.

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately and concisely describes the main changes: updating the Google ADK README to use a newer Gemini model.
Description check	✅ Passed	The description clearly relates to the changeset, documenting the README updates and version bump with appropriate context about testing.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/update-google-adk-gemini-35-flash

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