chore(deps): bump keras from 2.10.0 to 3.13.1 in /docs

Bumps [keras](https://github.com/keras-team/keras) from 2.10.0 to 3.13.1.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](keras-team/keras@v2.10.0...v3.13.1)

---
updated-dependencies:
- dependency-name: keras
  dependency-version: 3.13.1
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

docs/requirements.txt

@@ -31,7 +31,7 @@ importlib-resources==6.0.1
 Jinja2==3.1.2
 jsonschema==4.19.0
 jsonschema-specifications==2023.7.1
-keras==2.10.0
+keras==3.13.1
 Keras-Preprocessing==1.1.2
 kiwisolver==1.4.4
 latexcodec==2.0.1