ci: add python versions to matrix

Add Python 3.12 and 3.13 along with PyPy 3.10.

Author: jpgrayson

.github/workflows/ci.yml

@@ -69,7 +69,17 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ['3.7', '3.8', '3.9', '3.10', '3.11', 'pypy-3.7', 'pypy-3.9']
+        python-version:
+          - '3.7'
+          - '3.8'
+          - '3.9'
+          - '3.10'
+          - '3.11'
+          - '3.12'
+          - '3.13'
+          - 'pypy-3.7'
+          - 'pypy-3.9'
+          - 'pypy-3.10'
 
     steps:
     - uses: actions/checkout@v4