Use assertEqual instead of assertEquals for Python 3.11 compatibility.

[tirkarthi]

Description

The deprecated aliases were removed in Python 3.11 in python/cpython#28268 . Hence use assertEquals .

Fixes #278

Type of change

Please delete options that are not relevant.

• New algorithm or support class.
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. If you haven't added any test and it is relevant provide instructions so we can reproduce.

• I have added a new test file: [E.g. test_rf.py]
• I have added a new test case: [E.g. RFTest.test_make_classification]
• I have tested it manually in a local environment.
• I have tested it manually in a supercomputer.

Reproduce instructions:

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, particularly in hard-to-understand areas.
• I have documented the public methods of any public class according to the guide styles.
• I have made corresponding changes to the documentation
• New and existing unit tests pass locally with my changes
• I have rebased my branch before trying to merge.

[codecov]

Codecov Report

Merging #358 (fdec263) into master (56209f1) will increase coverage by 0.04%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #358      +/-   ##
==========================================
+ Coverage   97.76%   97.81%   +0.04%     
==========================================
  Files          42       42              
  Lines        4529     4529              
==========================================
+ Hits         4428     4430       +2     
+ Misses        101       99       -2     

Impacted Files	Coverage Δ
dislib/data/array.py	96.98% <0.00%> (+0.28%)	⬆️

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