Update build_default.yml

Author: vineetbansal

.github/workflows/build_default.yml

@@ -44,7 +44,7 @@ jobs:
       env:
         CIBW_BUILD: cp38-* cp39-* cp310-* cp311-* cp312-*
         CIBW_SKIP: "*-win32 *-manylinux_i686 *-musllinux_*"
-        CIBW_TEST_REQUIRES: pytest torch numdifftools
+        CIBW_BEFORE_TEST: pip3 install pytest numdifftools && pip3 install torch --index-url https://download.pytorch.org/whl/nightly/cpu
         CIBW_TEST_COMMAND: "python -m pytest -s {project}/src/osqp/tests"
 
     - name: Build source