fix github workflow typo

Author: calmmage

.github/workflows/main.yml

@@ -7,7 +7,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [ 3.12", "3.13" ]
+        python-version: [ "3.12", "3.13" ]
     steps:
       - uses: actions/checkout@v3
       - name: Set up Python ${{ matrix.python-version }}