Test on multiple versions of Python.

Author: Kodiologist

.github/workflows/tests.yml

@@ -6,7 +6,15 @@ jobs:
   test:
     runs-on: ubuntu-latest
 
+    strategy:
+      fail-fast: false
+      matrix:
+        python: ['3.10', 3.11, 3.12, pypy-3.10]
+
     steps:
+    - uses: actions/setup-python@v4
+      with:
+        python-version: ${{ matrix.python }}
     - uses: actions/checkout@v3
     - run: python3 util/install_deps.py
     - run: pip install .