Test against Python 3.12 stable and 3.13-dev

.github/workflows/ci.yml

diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c7086c9..fd61da3 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -32,7 +32,8 @@
         - "3.9"
         - "3.10"
         - "3.11"
-        - "3.12-dev"
+        - "3.12"
+        - "3.13-dev"
     steps:
     - uses: actions/checkout@9bb56186c3b09b4f86b1c65136769dd318469633 # v4.1.2
     - name: Set up Python ${{ matrix.python-version }}