Update python-package.yml

.github/workflows/python-package.yml

@@ -27,8 +27,7 @@ jobs:
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip
-        python -m pip install flake8 pytest
-        python -m pip install radiation_unit_conversion[test]
+        python -m pip install flake8 pytest numpy astropy unittest
         if [ -f requirements.txt ]; then pip install -r requirements.txt; fi
     - name: Lint with flake8
       run: |