Actually install the GSL on Mac ARM

Author: jobovy

.github/workflows/wheels.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: actions/checkout@v4
       - name: Install GSL (Windows / Mac OS x86_64)
         uses: mamba-org/setup-micromamba@v1
-        if: matrix.buildplat[1] == 'win' || ( matrix.buildplat[1] == 'macosx' && matrix.buildplat[2] == 'x86_64' )
+        if: matrix.buildplat[1] == 'win' || matrix.buildplat[1] == 'macosx'
         with:
           environment-name: gsl
           condarc: |