Restore pip upgrade

Author: NeonGraal

.github/workflows/python-package.yml

@@ -26,6 +26,7 @@ jobs:
         python-version: ${{ matrix.python-version }}
     - name: Install dependencies
       run: |
+        python -m pip install --upgrade pip
         pip install -r requirements_dev.txt
     - name: Lint with flake8
       run: |