Update keras-nlp to keras-hub

[sachinprasadhs]

Description of the change

Update keras-nlp to keras-hub which is the latest package

Motivation

Type of change

Choose one: (Bug fix | Feature request | Documentation | Other)

Checklist

• I have performed a self-review of my code.
• I have added detailed comments to my code where applicable.
• I have verified that my change does not break existing code.
• My PR is based on the latest changes of the main branch (if unsure, please run git pull --rebase upstream main).
• I am familiar with the Google Style Guide for the language I have coded in.
• I have read through the Contributing Guide and signed the Contributor License Agreement.

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