Migrating OAuth notebook

[Aarchi-07]

• Updated SDK imports
• lint checked
• nbfmt

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Summary of Changes

Hello @Aarchi-07, I'm Gemini Code Assist[^1]! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request focuses on updating the Authentication_with_OAuth.ipynb quickstart notebook to align with current best practices and SDK versions. The primary goal is to transition the notebook's code to use the google-genai library, replacing its predecessor. This involves modifying import statements, enhancing API key security through google.colab.userdata, and ensuring the notebook's output reflects the latest execution results and formatting standards.

Highlights

• SDK Migration: The notebook has been migrated from using the older google-generativeai SDK to the newer google-genai SDK, ensuring compatibility with the latest library features and practices.
• API Key Management: API key handling has been updated to leverage google.colab.userdata, providing a more secure method for managing sensitive credentials within the notebook environment.
• Notebook Formatting and Execution: The notebook has undergone linting and formatting (nbfmt), and all cells have been re-executed, updating the saved outputs for package installations and model listings.

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[Aarchi-07]

I was unable to migrate the "Authenticate with the Python SDK by service account key" section and would appreciate any guidance.