Update pytest test file path and actions version

Author: neilernst

.github/workflows/build_package.yml

@@ -22,9 +22,9 @@ jobs:
           python -m pip install --upgrade pip
           pip install pytest
       - name: Test with pytest
-        run: pytest test_cliff.py --doctest-modules --junitxml=junit/test-results-${{ matrix.python-version }}.xml
+        run: pytest cliffs_delta/test_cliff.py --doctest-modules --junitxml=junit/test-results-${{ matrix.python-version }}.xml
       - name: Upload pytest test results
-        uses: actions/upload-artifact@v2
+        uses: actions/upload-artifact@v4
         with:
           name: pytest-results-${{ matrix.python-version }}
           path: junit/test-results-${{ matrix.python-version }}.xml