## Description
---
Updating the Gemini model from 1.5-flash to 2.0-flash in the Go
Quickstart tests for LangChain and Genkit samples.
This PR fixes the failing tests in
https://github.com/googleapis/genai-toolbox/pull/1572
## PR Checklist
---
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[bug/issue](https://github.com/googleapis/genai-toolbox/issues/new/choose)
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🛠️ Fixes #<issue_number_goes_here>
