feat: update Veo model to 3.1 for video extension

[katiemn]

Description

Update the Veo video extension sample to use the latest Veo 3.1 model

[gemini-code-assist]

Summary of Changes

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This pull request updates the video extension sample to align with the latest version of the Veo model. This ensures the sample code leverages the most current capabilities for video generation and reflects any changes in the API's configuration requirements, such as the removal of the aspect_ratio parameter.

Highlights

• Veo Model Update: The video generation sample has been updated to use the latest Veo 3.1 model, specifically changing from veo-2.0-generate-001 to veo-3.1-generate-preview.
• Configuration Parameter Removal: The aspect_ratio parameter, previously set to 16:9, has been removed from the GenerateVideosConfig object in the video generation call.

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[gemini-code-assist]

Code Review

This pull request updates the video generation sample to use the newer veo-3.1-generate-preview model and correctly removes the aspect_ratio parameter. The change is straightforward and functional. I have one suggestion to improve code maintainability by defining the model name as a constant.