Update Conda dependency on khiops-core to 10.2.3b.4

Thus, we ensure a `khiops-core` version that uses the updated
`khiops_env` is installed.

Author: popescu-v

packaging/conda/meta.yaml

@@ -26,7 +26,7 @@ requirements:
     - python
   run:
     - python
-    - khiops-core >=10.2.2b.3,<11.0.0
+    - khiops-core >=10.2.3b.4,<11.0.0
     - pandas >=0.25.3
     - scikit-learn >=0.22.2
   run_constrained: