Update python-package.yml

Author: Giuseppe De Marco

.github/workflows/python-package.yml

@@ -30,7 +30,8 @@ jobs:
     - name: Install dependencies and testing utilities
       run: |
         sudo apt-get update && sudo apt-get install xmlsec1
-        python -m pip install --upgrade pip tox rstcheck setuptools codecov
+        python -m pip install --upgrade pip
+        python -m pip install --upgrade tox rstcheck setuptools codecov
     #- name: Readme check
       #if: ${{ matrix.python-version }} == 3.8 && ${{ matrix.django-version }} == "3.0"
       #run: rstcheck README.rst