Bump keras from 2.12.0 to 2.13.1

Bumps [keras](https://github.com/keras-team/keras) from 2.12.0 to 2.13.1.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](keras-team/keras@v2.12.0...v2.13.1)

---
updated-dependencies:
- dependency-name: keras
  dependency-type: indirect
...

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Author: dependabot[bot]