Use current model for image generation

[gzip]

The Generate Images cell currently generates the following error when executed:

ERROR: ClientError: got status: 404 NOT_FOUND. {"error":{"code":404,"message":"Requested entity was not found.","status":"NOT_FOUND"}}

[gemini-code-assist]

Summary of Changes

Hello @gzip, I'm Gemini Code Assist¹! 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 addresses a critical issue preventing the image generation example from functioning correctly. By updating the model identifier to the current version, it ensures the quickstart guide remains accurate and provides a working demonstration of Gemini's image generation capabilities.

Highlights

• Image Generation Model Update: The model parameter used for image generation in quickstarts-js/Get_Started.js has been updated from gemini-2.0-flash-preview-image-generation to gemini-2.5-flash-image-preview to resolve a 404 NOT_FOUND error.

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[gemini-code-assist]

Code Review

This pull request correctly updates the model name for image generation, resolving a 404 error. My feedback focuses on improving the code's maintainability by defining the model name as a constant, in line with the repository's established style and best practices.