test support for older versions of python

Author: Xavier Medrano

.github/workflows/python-publish.yml

@@ -35,7 +35,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [windows-latest, macos-latest, ubuntu-latest]
-        python-version: [3.9, "3.10", "3.11", "3.12", "3.13-dev"]
+        python-version: ["3.6", "3.7", "3.8", "3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
     - uses: actions/checkout@v2