Bumping tf-keras version to align with the latest TensorFlow version to work for our MG models in colab.

PiperOrigin-RevId: 615183793

Author: tensorflower-gardener

official/requirements.txt

@@ -10,7 +10,7 @@ scipy>=0.19.1
 tensorflow-hub>=0.6.0
 tensorflow-model-optimization>=0.4.1
 tensorflow-datasets
-tf-keras
+tf-keras>=2.16.0
 gin-config
 tf_slim>=1.1.0
 Cython