pin keras core

.github/workflows/tests.yml

@@ -23,7 +23,7 @@ jobs:
         run: |
           python -m pip install --upgrade pip
           python -m pip install pytreeclass>=0.4.0
-          python -m pip install keras_core>=0.1.1
+          python -m pip install keras_core==0.1.1
           python -m pip install scikit-learn
           python -m pip install pytest wheel optax jaxlib coverage kernex
       - name: Pytest Check