test with the latest Python version (3.12) (#618)

Author: njzjz

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9]
+        python-version: ["3.7", "3.8", "3.12"]
 
     steps:
     - uses: actions/checkout@v2