CI: Use Python 3.10 for CTK tests

Author: amotl

.github/workflows/application-cratedb-toolkit.yml

@@ -40,7 +40,7 @@ jobs:
         os:
           - 'ubuntu-22.04'
         python-version:
-          - '3.9'
+          - '3.10'
           - '3.12'
         cratedb-version:
           - 'nightly'