Bump keras from 3.3.3 to 3.9.0 in /larq_compute_engine

Bumps [keras](https://github.com/keras-team/keras) from 3.3.3 to 3.9.0.
- [Release notes](https://github.com/keras-team/keras/releases)
- [Commits](keras-team/keras@v3.3.3...v3.9.0)

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

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

Author: dependabot[bot]

larq_compute_engine/requirements.txt

@@ -59,7 +59,7 @@ importlib-resources==6.4.0
     # via etils
 iniconfig==2.0.0
     # via pytest
-keras==3.3.3
+keras==3.9.0
     # via tensorflow
 larq==0.13.3
     # via -r requirements.in
@@ -97,6 +97,7 @@ optree==0.11.0
     # via keras
 packaging==24.1
     # via
+    #   keras
     #   larq
     #   pytest
     #   tensorflow