Pin mlflow<3.7 in azureml-in-a-day tutorial

MLflow 3.7.0 (released Dec 5, 2025) introduced breaking changes incompatible
with Azure ML no-code MLflow deployment. Pin to <3.7 to keep the 3.x model
format while avoiding the breaking version.

Author: Chakradhar886

tutorials/azureml-in-a-day/azureml-in-a-day.ipynb

@@ -193,7 +193,7 @@
                 "  - pip:\n",
                 "    - inference-schema[numpy-support]==1.3.0\n",
                 "    - xlrd==2.0.1\n",
-                "    - mlflow\n",
+                "    - mlflow<3.7\n",
                 "    - azureml-mlflow\n",
                 "    - psutil\n",
                 "    - tqdm\n",