chore: add python3.13 to test matrix

Author: mxyng

.github/workflows/test.yaml

@@ -7,7 +7,7 @@ jobs:
   test:
     strategy:
       matrix:
-        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12']
+        python-version: ['3.8', '3.9', '3.10', '3.11', '3.12', '3.13']
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4