tests: modernize deprecated numpy assertions in test_helix_analysis.p…

[AnimeshPriyanshu]

Fixes #3743

Changes made in this Pull Request

• Replaced deprecated assert_almost_equal() assertions with assert_allclose() in testsuite/MDAnalysisTests/analysis/test_helix_analysis.py.
• Replaced scalar floating-point comparison with pytest.approx() where appropriate.
• Removed the deprecated assert_almost_equal import.
• Added my name to package/AUTHORS.

LLM / AI generated code disclosure

LLMs or other AI-powered tools (beyond simple IDE use cases) were used in this contribution: yes

PR Checklist

• Issue raised/referenced?
• Tests updated/added?
• Documentation updated/added?
• package/CHANGELOG file updated?
• Is your name in package/AUTHORS? (If it is not, add it!)
• LLM/AI disclosure was updated.

Testing

Ran:

python -m pytest testsuite/MDAnalysisTests/analysis/test_helix_analysis.py

Result:

46 passed

Developers Certificate of Origin

I certify that I can submit this code contribution as described in the Developer Certificate of Origin, under the MDAnalysis LICENSE.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 93.85%. Comparing base (d25f074) to head (e618fd9).
⚠️ Report is 4 commits behind head on develop.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #5408      +/-   ##
===========================================
+ Coverage    93.63%   93.85%   +0.21%     
===========================================
  Files          182      182              
  Lines        22509    22509              
  Branches      3202     3202              
===========================================
+ Hits         21076    21125      +49     
+ Misses         965      922      -43     
+ Partials       468      462       -6     

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