Unfreeze keras version as incorrect version issue was fixed. This also...

Unfreeze keras version as incorrect version issue was fixed. This also resolved the endless TF ODT API pip install issue.

PiperOrigin-RevId: 413804051

research/object_detection/packages/tf2/setup.py

@@ -23,9 +23,7 @@ REQUIRED_PACKAGES = [
     'pandas',
     'tf-models-official>=2.5.1',
     'tensorflow_io',
-    # Workaround due to
-    # https://github.com/keras-team/keras/issues/15583
-    'keras==2.6.0'
+    'keras'
 ]
 
 setup(