TSML/PyCaret woes: Downgrade to Python 3.10

On CI/GHA/Python 3.11, we receive this error:

   ERROR automl_timeseries_forecasting_with_pycaret.py -
   TypeError: descriptor '__call__' for 'type' objects doesn't apply
   to a 'property' object

On the other hand, `ngr test topic/machine-learning/automl` works well
on our workstation on Python 3.10, so let's try that on CI as well.

.github/workflows/ml-automl.yml

@@ -37,7 +37,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ 'ubuntu-latest' ]
-        python-version: [ '3.11' ]
+        python-version: [ '3.10' ]
         cratedb-version: [ 'nightly' ]
 
     services: