Switch python 3.12 test target to non-dev.

Author: Tom Hendrikx

.github/workflows/tests.yaml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python_version: ["3.8", "3.9", "3.10", "3.11", "3.12-dev", "pypy-3.9", "pypy-3.10"]
+        python_version: ["3.8", "3.9", "3.10", "3.11", "3.12", "pypy-3.9", "pypy-3.10"]
     steps:
       - name: Checkout code
         uses: actions/checkout@v3