Fix pytest command path in CI workflow

Author: tkralphs

.github/workflows/ci-cvxpy.yml

@@ -65,4 +65,4 @@ jobs:
       - name: Test CVXPY
         run: |
           python3 -m pip install --break-system-packages pytest hypothesis ${{ matrix.numpy }}
-          (cd cvxpy/cvxpy/tests && python3 -m pytest -v .)
+          python3 -m pytest -v cvxpy/cvxpy/tests/