ML/LangChain: Verify examples on Python 3.13

Author: amotl

.github/workflows/ml-langchain.yml

@@ -37,7 +37,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ 'ubuntu-latest' ]
-        python-version: [ '3.10', '3.11', '3.12' ]
+        python-version: [ '3.10', '3.11', '3.12', '3.13' ]
         cratedb-version: [ 'nightly' ]
 
     services: