Update spectral_radius in esn_cell.py

[muriloasouza]

Change self.spectral_radius for tf.cast(self.spectral_radius, dtype) in lines 146 and 152.

Description

Change the spectral radius of esn_cell.py. More info in the following link:

https://github.com/tensorflow/addons/issues/2792

@bhack

Fixes # (issue)

Type of change

• [ ] Bug fix
• [ ] New Tutorial
• [ ] Updated or additional documentation
• [ ] Additional Testing
• [ ] New Activation and the changes conform to the activation contribution guidelines
• [ ] New Callback and the changes conform to the callback contribution guidelines
• [ ] New Image addition and the changes conform to the image op contribution guidelines
• [ ] New Layer and the changes conform to the layer contribution guidelines
• [ ] New Loss and the changes conform to the loss contribution guidelines
• [ ] New Metric and the changes conform to the metric contribution guidelines
• [ ] New Optimizer and the changes conform to the optimizer contribution guidelines
• [ ] New RNN Cell and the changes conform to the rnn contribution guidelines
• [ ] New Seq2seq addition and the changes conform to the seq2seq contribution guidelines
• [ ] New Text addition and the changes conform to the text op contribution guidelines

Checklist:

• [ ] I've properly formatted my code according to the guidelines
  • [ ] By running Black + Flake8
  • [ ] By running pre-commit hooks
• [ ] This PR addresses an already submitted issue for TensorFlow Addons
• [ ] I have made corresponding changes to the documentation
• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] This PR contains modifications to C++ custom-ops

How Has This Been Tested?

Tested in the following code:

https://gist.github.com/muriloasouza/6b928d762fbbd2f748c68bc99eaf8382

Before this change, the code didn't work.

Heres the csv file:

https://gist.github.com/muriloasouza/5f97167faf7a066cf2ad2858fbd4b1f5

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[bot-of-gabrieldemarmiesse]

@pedrolarben

You are owner of some files modified in this pull request. Would you kindly review the changes whenever you have the time to? Thank you very much.