Add workaround for segfault in MacOS tests#1184
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Recent versions of OpenMP (i.e. >= 12) cause segfaults in MacOS when training LightGBM / XGBoost models (but only when Torch is present). This PR downgrades OpenMP to an older version (i.e. == 11).
See lightgbm-org/LightGBM#4229 and autogluon/autogluon#1442 for more details.