Try 3 to make cibuildwheels test work

Author: harripd

.github/workflows/build_wheels.yml

@@ -15,7 +15,7 @@ jobs:
     steps:
       - uses: actions/checkout@v2
       - name: install pytest
-        run: pip install pytest
+        run: python -m pip install pytest
 
       - name: Build wheels
         uses: pypa/cibuildwheel@v2.2.2