CI: Update python version

Author: bashtage

.github/workflows/build-wheels.yml

@@ -108,7 +108,7 @@ jobs:
           # Note that this step is *after* specific pythons have been used to
           # build and test the wheel
           auto-update-conda: true
-          python-version: "3.11"
+          python-version: "3.12"
           miniforge-version: latest
           conda-remove-defaults: "true"