fallback to pip

Author: youtux

.github/workflows/main.yml

@@ -17,8 +17,8 @@ jobs:
           cache: "pip"
       - name: Install pypa/build
         run: |
-          python3 -m pip install --user pipx
-          pipx install build@latest twine@latest
+          python3 -m pip upgrade
+          python3 -m pip install --user --upgrade build twine
           build --version
           twine --version
       - name: Build a binary wheel and a source tarball