Updating pip whenever its possible

.github/workflows/python-publish.yml

@@ -39,6 +39,9 @@ jobs:
         name: Install Python
         with:
           python-version: "3.8"
+
+      - name: Before build
+        run: pip install --upgrade pip
 
       - name: Build wheels
         uses: joerick/cibuildwheel@v1.10.0
@@ -59,7 +62,7 @@ jobs:
           python-version: "3.8"
 
       - name: Build sdist
-        run: pip install numpy && python setup.py sdist build_src --inplace
+        run: pip install --upgrade pip && pip install numpy && python setup.py sdist build_src --inplace
 
       - uses: actions/upload-artifact@v2
         with: