fix: fix NaN handling in ssqrt, scbrt, slog

[AayushSabharwal]

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[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 0% with 3 lines in your changes missing coverage. Please review.

Project coverage is 8.87%. Comparing base (eced900) to head (b6e060a).
Report is 8 commits behind head on master.

Files with missing lines	Patch %	Lines
src/solver/solve_helpers.jl	0.00%	3 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff            @@
##           master   #1432      +/-   ##
=========================================
- Coverage    8.88%   8.87%   -0.01%     
=========================================
  Files          51      51              
  Lines        4876    4879       +3     
=========================================
  Hits          433     433              
- Misses       4443    4446       +3     

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