chore(genai) Update Gemini model version for live_websocket_audioscript_with_txt

[XrossFox]

Description

Fixes b/481470123

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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 @XrossFox, 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 Gemini model version used in the live_websocket_audiotranscript_with_txt.py sample. The change ensures that the sample leverages the latest available Gemini model, gemini-live-2.5-flash-native-audio, which likely brings performance improvements or access to newer features for live audio transcription. This update also resolves a specific internal bug.

Highlights

• Gemini Model Update: The GEMINI_MODEL_NAME constant has been updated from gemini-2.0-flash-live-preview-04-09 to gemini-live-2.5-flash-native-audio in the live websocket audio transcription script.
• Bug Fix: This change addresses and fixes an internal bug identified as b/481470123.

Changelog

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

Activity

• The pull request was initiated by XrossFox.
• The author has indicated a preference for automatic merging once the PR is approved.

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[gemini-code-assist]

Code Review

This pull request updates the Gemini model version used in the live_websocket_audiotranscript_with_txt.py sample. The change is a straightforward update to the GEMINI_MODEL_NAME constant, replacing an older model version with gemini-live-2.5-flash-native-audio. The change appears correct and aligns with the pull request's goal. I have no specific feedback on this modification.