remove cplex from macos solver deps

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 84.15%. Comparing base (58cc070) to head (72035c4).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #280 +/- ## ========================================== - Coverage 88.87% 84.15% -4.72% ========================================== Files 15 15 Lines 3666 3666 Branches 860 860 ========================================== - Hits 3258 3085 -173 - Misses 283 462 +179 + Partials 125 119 -6 ```

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