chore(genai): Update gemini model version to 2.5 in live websocket audiogen with txt

[angelcaamal]

Description

Fixes #481469433

Note: Before submitting a pull request, please open an issue for discussion if you are not associated with Google.

Checklist

• I have followed Sample Guidelines from AUTHORING_GUIDE.MD
• README is updated to include all relevant information
• Tests pass: nox -s py-3.9 (see Test Environment Setup)
• Lint pass: nox -s lint (see Test Environment Setup)
• These samples need a new API enabled in testing projects to pass (let us know which ones)
• These samples need a new/updated env vars in testing projects set to pass (let us know which ones)
• This sample adds a new sample directory, and I updated the CODEOWNERS file with the codeowners for this sample
• This sample adds a new Product API, and I updated the Blunderbuss issue/PR auto-assigner with the codeowners for this sample
• Please merge this PR for me once it is approved

[gemini-code-assist]

Summary of Changes

Hello @angelcaamal, 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 updates the version of the Gemini model utilized within the live websocket audio generation sample. The change ensures that the sample leverages the latest gemini-live-2.5-flash-native-audio model, providing access to potentially improved features and performance for real-time audio generation from text.

Highlights

• Gemini Model Update: The GEMINI_MODEL_NAME constant in live_websocket_audiogen_with_txt.py has been updated from gemini-2.0-flash-live-preview-04-09 to gemini-live-2.5-flash-native-audio.

Changelog

• genai/live/live_websocket_audiogen_with_txt.py
  • Updated the GEMINI_MODEL_NAME constant to gemini-live-2.5-flash-native-audio.

Activity

• The pull request addresses issue #481469433.
• The author has provided a checklist, but all items are currently unchecked.

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[gemini-code-assist]

Code Review

This pull request updates the Gemini model version in one of the samples. My review suggests expanding the scope of this change to other relevant sample files for consistency, as detailed in the comment.