DRAFT: GitHub Actions: Test on Python 3.12

Repeats #8777
* #8777 

Some of our dependencies will not be ready yet.

Author: cclauss

Diff for: .github/workflows/build.yml

@@ -9,10 +9,11 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
       - uses: actions/setup-python@v4
         with:
-          python-version: 3.11
+          python-version: 3.12
+          allow-prereleases: true
       - uses: actions/cache@v3
         with:
           path: ~/.cache/pip