changing to v4. set up build

Author: Marcello17

.github/workflows/python-publish.yml

@@ -67,7 +67,7 @@ jobs:
     needs: [details, check_pypi]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Set up Python
         uses: actions/setup-python@v4