ci: remove python 12

Author: bamthomas

.github/workflows/tests.yaml

@@ -19,7 +19,7 @@ jobs:
       fail-fast: true
       matrix:
         os: [ "ubuntu-latest" ]
-        python-version: [ "3.9", "3.10", "3.11", "3.12" ]
+        python-version: [ "3.9", "3.10", "3.11" ]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out repository