Bump keras from 3.9.2 to 3.13.2

Bumps [keras](https://github.com/keras-team/keras) from 3.9.2 to 3.13.2.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](keras-team/keras@v3.9.2...v3.13.2)

---
updated-dependencies:
- dependency-name: keras
  dependency-version: 3.13.2
  dependency-type: direct:production
...

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Author: dependabot[bot]