Support the new version of Keras 2.4

[PhilkaUA]

Will there be an update to the library to support the new version of Keras 2.4?

I have encountered a problem that when I create a microservice based on deep segment and flask I get an error, which is based on the fact that Keras 2.3.1 does not work with multi threading

error that occurs looks like this:

File "/keras/engine/training.py", line 1452, in predict
    if self._uses_dynamic_learning_phase():
  File "/keras/engine/training.py", line 382, in _uses_dynamic_learning_phase
    not isinstance(K.learning_phase(), int))
  File "/keras/backend/tensorflow_backend.py", line 73, in symbolic_fn_wrapper
    if _SYMBOLIC_SCOPE.value:
AttributeError: '_thread._local' object has no attribute 'value'