Add scipy as dependency for github test run

.github/workflows/python-app.yml

@@ -20,7 +20,7 @@ jobs:
     - name: Install dependencies
       shell: bash -l {0}
       run: |
-        conda install flake8 gdal cloudpickle
+        conda install flake8 gdal cloudpickle scipy
     - name: Lint with flake8
       shell: bash -l {0}
       run: |