remove openmp install

Author: jmoralez

.github/workflows/ci.yaml

@@ -57,10 +57,6 @@ jobs:
       - name: Install the library
         run: pip install uv && uv pip install --system ".[dev]"
 
-      - name: Install OpenMP
-        if: startsWith(matrix.os, 'macos')
-        run: brew install libomp
-
       - name: Run local tests
         run: nbdev_test --n_workers 0 --do_print --timing --skip_file_re "(distributed|electricity)" --flags 'polars'