put strings around the python versions to fix workflow

Author: gschnabel

.github/workflows/publish_package.yml

@@ -19,7 +19,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, windows-latest, macos-13, macos-14]
-        python-version: [3.7, 3.8, 3.9, 3.10, 3.11]
+        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11']
 
     steps:
       - uses: actions/checkout@v4