spread py versions

Author: dugalh

.github/workflows/run-unit-tests_conda-forge.yml

@@ -17,7 +17,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ macos-latest, ubuntu-latest, windows-latest ]
-        python-version: ['3.9', '3.10', '3.11']
+        python-version: ['3.9', '3.11', '3.12']
 
     steps:
     - name: Check out repository