Relax flakey test because of a bug in MathOptIIS

[odow]

CI failed in #69, I think because of a tolerance issue with SCS.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.39%. Comparing base (d27b1de) to head (6f64f31).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #70   +/-   ##
=======================================
  Coverage   98.39%   98.39%           
=======================================
  Files          14       14           
  Lines        1437     1437           
=======================================
  Hits         1414     1414           
  Misses         23       23           

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