Bump keras from 3.9.2 to 3.12.0

Bumps [keras](https://github.com/keras-team/keras) from 3.9.2 to 3.12.0.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](keras-team/keras@v3.9.2...v3.12.0)

---
updated-dependencies:
- dependency-name: keras
  dependency-version: 3.12.0
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements.txt

@@ -36,7 +36,7 @@ jaxlib==0.6.0
 jaxtyping==0.3.1
 jinja2==3.1.6
 kagglehub==0.3.11
-keras==3.9.2
+keras==3.12.0
 keras-hub==0.20.0
 libclang==18.1.1
 libcst==1.7.0