More recent Python 3.12 version

Author: spookylukey

.github/workflows/pythonpackage.yml

@@ -15,7 +15,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     strategy:
       matrix:
-        python-version: [3.7, 3.8, 3.9, "3.10", "3.11", "3.12.0-alpha.7"]
+        python-version: [3.7, 3.8, 3.9, "3.10", "3.11", "3.12.0-beta.4"]
         os: [ubuntu-latest]
         include:
           - python-version: 3.6