Update main.yml

Author: MacHu-GWU

.github/workflows/main.yml

@@ -20,7 +20,7 @@ jobs:
       matrix:
         os: ["ubuntu-latest", "windows-latest"]
 #        os: ["ubuntu-latest", ] # for debug only
-        python-version: [""3.8", "3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12"]
 #        python-version: ["3.8", ] # for debug only
         exclude:
           - os: windows-latest # this is a useless exclude rules for demonstration use only