Update Keras min Test version to 3.9 (#2434)

* Update python min version to 3.9

* update Keras min version t0 3.9

* pin jax version

Author: sachinprasadhs

.github/workflows/actions.yml

@@ -20,7 +20,7 @@ jobs:
         version: [keras-stable]
         include:
           - backend: jax
-            version: keras-3.8
+            version: keras-3.9
           - backend: jax
             version: keras-nightly
           - backend: openvino
@@ -50,11 +50,11 @@ jobs:
       run: |
           pip install -r requirements.txt --progress-bar off
           pip install --no-deps -e "." --progress-bar off
-    - name: Pin Keras 3.8
-      if: ${{ matrix.version == 'keras-3.8'}}
+    - name: Pin Keras 3.9
+      if: ${{ matrix.version == 'keras-3.9'}}
       run: |
         pip uninstall -y keras jaxlib jax
-        pip install keras==3.8.0 --progress-bar off
+        pip install keras==3.9.0 --progress-bar off
         pip install jax==0.6.0 --progress-bar off
     - name: Pin Keras Nightly
       if: ${{ matrix.version == 'keras-nightly'}}