ci: add python 3.12 checks

.github/workflows/test.yml

@@ -7,12 +7,15 @@ on:
 jobs:
   tests:
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+         python-version: ['3.8', '3.12']
     steps:
-      - uses: actions/checkout@v2
-      - name: Set up Python 3.8
-        uses: actions/setup-python@v2
+      - uses: actions/checkout@v3
+      - name: Set up Python
+        uses: actions/setup-python@v5
         with:
-          python-version: 3.8
+          python-version:  ${{ matrix.python-version }}
       - name: Upgrade pip
         run: python -m pip install --upgrade pip setuptools
       - name: Install dependencies