Migrate to assertEqual

[emmanuel-ferdman]

Description

This small PR migrates from unittest.assertEquals to unittest.assertEqual which is deprecated from Python2.7:

DeprecationWarning: Please use assertEqual instead.

Type of change

Please check all relevant options.

• Improvement (non-breaking)
• Bug fix (non-breaking)
• New feature (non-breaking)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Testing

Test Configuration:

• OS
• Python version
• ART version or commit number
• TensorFlow / Keras / PyTorch / MXNet version

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• My changes have been tested using both CPU and GPU devices

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.28%. Comparing base (af90a12) to head (b3a8e6e).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2627   +/-   ##
=======================================
  Coverage   85.28%   85.28%           
=======================================
  Files         334      334           
  Lines       31008    31008           
  Branches     5228     5228           
=======================================
  Hits        26445    26445           
  Misses       3083     3083           
  Partials     1480     1480           

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