Update contest.py location for NumPy workflow

Author: honno

.github/workflows/numpy.yml

@@ -24,7 +24,7 @@ jobs:
     - name: Run the test suite
       run: |
         # Mark some known issues as XFAIL
-        cat << EOF >> conftest.py
+        cat << EOF >> array_api_tests/conftest.py
 
         names_to_be_xfailed = (
             # https://github.com/numpy/numpy/issues/18881