Fix incorrect dkpy directory again

.github/workflows/test-package.yml

@@ -21,7 +21,7 @@ jobs:
       run: |
         python -m pip install --upgrade pip
         python -m pip install -r requirements.txt
-        python -m pip install ./src
+        python -m pip install ./dkpy
     - name: Test with pytest
       run: |
         pytest --exitfirst