feat: change aspect ratio for veo r2v sample

[katiemn]

Description

Update aspect ratio in Veo 3.1 Reference-to-Video code sample.

[gemini-code-assist]

Summary of Changes

Hello @katiemn, 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 Veo 3.1 Reference-to-Video code sample to demonstrate a different video generation scenario. The changes primarily involve adjusting the output video's aspect ratio from a landscape 16:9 to a portrait 9:16, along with updating the corresponding prompt and reference image to align with this new vertical format. This provides a fresh example for users exploring the video generation capabilities.

Highlights

• Aspect Ratio Update: The aspect_ratio in the videogen_with_reference.py sample has been changed from "16:9" to "9:16", shifting the output video format from landscape to portrait.
• Sample Scenario Refresh: The video generation prompt and reference_image have been updated to reflect a new scenario, moving from a rotating coffee mug to a person placing a vase of flowers, aligning with the new aspect ratio.

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[gemini-code-assist]

Code Review

This pull request updates the code sample for reference-to-video generation in videogen_with_reference.py. The prompt, reference image, and aspect ratio have been changed to reflect a new example. The changes are clear, correct, and consistent with the style of other code samples in this repository. The code looks good and I have no suggestions for improvement.