Update fixed preset version for gemma3

[sachinprasadhs]

Description of the change

Reference

Colab Notebook

Checklist

• I have added all the necessary unit tests for my change.
• I have verified that my change does not break existing code and works with all backends (TensorFlow, JAX, and PyTorch).
• My PR is based on the latest changes of the main branch (if unsure, rebase the code).
• I have followed the Keras Hub Model contribution guidelines in making these changes.
• I have followed the Keras Hub API design guidelines in making these changes.
• I have signed the Contributor License Agreement.

[gemini-code-assist]

Summary of Changes

Hello @sachinprasadhs, 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 metadata for the Gemma3 and Gemma3-instruct 270M models. Specifically, it corrects the reported parameter count to a more precise value and updates the Kaggle handle versions to reflect the latest available presets for these models.

Highlights

• Gemma3 270M Model Metadata Update: The 'params' field for the 'gemma3_270m' preset has been updated from '270000000' to '268098176', and its 'kaggle_handle' version has been incremented from '1' to '3'.
• Gemma3 Instruct 270M Model Metadata Update: The 'params' field for the 'gemma3_instruct_270m' preset has been updated from '270000000' to '268098176', and its 'kaggle_handle' version has been incremented from '1' to '4'.

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[gemini-code-assist]

Code Review

This pull request updates the preset configurations for gemma3_270m and gemma3_instruct_270m models. The changes include updating the parameter counts to more precise values and bumping the version numbers in the Kaggle handles. The changes appear correct and align with the goal of keeping model metadata up-to-date. I've added a couple of comments regarding minor inconsistencies between the updated parameter counts and the model descriptions, which could be addressed for better clarity.