Update default khiops-core Conda package version to current beta

Should be updated to the 10.2.3 official khiops-core Conda package
release when it is available.

Author: popescu-v

.github/workflows/conda.yml

@@ -4,12 +4,12 @@ env:
   DEFAULT_SAMPLES_VERSION: 10.2.0
   # Note: The default Khiops version must never be an alpha release as they are
   #       ephemeral. To test alpha versions run the workflow manually.
-  DEFAULT_KHIOPS_CORE_VERSION: 10.2.2
+  DEFAULT_KHIOPS_CORE_VERSION: 10.2.3b.2
 on:
   workflow_dispatch:
     inputs:
       khiops-core-version:
-        default: 10.2.2
+        default: 10.2.3b.2
         description: khiops-core version for testing
       khiops-samples-version:
         default: 10.2.0