run linux tests in serial

Author: vtavana

.github/workflows/conda-package.yml

@@ -274,7 +274,7 @@ jobs:
         env:
             DPNP_TEST_ALL_INT_TYPES: 1
         run: |
-            pytest -n auto -ra --pyargs ${{ env.PACKAGE_NAME }}.tests
+            pytest -ra --pyargs ${{ env.PACKAGE_NAME }}.tests
 
   test_windows:
     name: Test ['windows-2019', python='${{ matrix.python }}']