Update ci-extensions.yaml

Author: larsbuntemeyer

.github/workflows/ci-extensions.yaml

@@ -26,7 +26,7 @@ jobs:
       matrix:
         os: ["ubuntu-latest"]
         # Bookend python versions
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.9", "3.10", "3.11", "3.12"]
     steps:
       - uses: actions/checkout@v4
         with: