add python 3.12

Signed-off-by: Inada Naoki <[email protected]>

.github/workflows/test.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.8", "3.9", "3.10", "3.11", "pypy3.9", "pypy3.10"]
+        python-version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy3.9", "pypy3.10"]
     steps:
     - uses: actions/checkout@v4
     - name: Set up Python