Remove numpy 2.0 workarounds

.github/workflows/osx.yml

@@ -37,9 +37,7 @@ jobs:
           brew install casacore
 
       - name: Make virtualenv
-        # XXX Use Homebrew's numpy to be safe for now, especially since
-        # PyPI is now on numpy 2.0, which complicates matters
-        run: python3 -m venv venv --system-site-packages
+        run: python3 -m venv venv
 
       - name: Install Python dependencies
         run: venv/bin/pip install --upgrade pip wheel delocate pytest
@@ -51,11 +49,9 @@ jobs:
         run: cd tests && ../venv/bin/pytest
 
       - name: Make binary wheel
-        # XXX Use Homebrew's numpy to be safe for now, especially since
-        # PyPI is now on numpy 2.0, which complicates matters
         run: |
           venv/bin/pip install --upgrade six scikit-build-core setuptools_scm
-          venv/bin/pip wheel -w dist --no-build-isolation .
+          venv/bin/pip wheel -w dist .
 
       - name: Delocate binary wheel
         run: venv/bin/delocate-wheel -v dist/*.whl