Fix ImageBuildFailure: update credit_defaults_model env to Python 3.9

Python 3.8 reached EOL (Oct 2024) and is no longer available in
conda-forge or Azure ML base images, causing ImageBuildFailure.

Changes to tutorials/get-started-notebooks/deploy/credit_defaults_model/:
- conda.yaml: python 3.8.15 -> 3.9, remove pip cap, mlflow 2.17.2
- requirements.txt: mlflow 2.17.2
- python_env.yaml: python 3.9, update pip/setuptools/wheel
- MLmodel: python_version 3.9

scikit-learn==0.24.2 is kept (required to load the model pickle).
mlflow==2.17.2 is the last release before 2.18.0 dropped Python 3.8.

Author: Chakradhar886

tutorials/get-started-notebooks/deploy/credit_defaults_model/MLmodel

@@ -4,7 +4,7 @@ flavors:
     env: conda.yaml
     loader_module: mlflow.sklearn
     model_path: model.pkl
-    python_version: 3.8.15
+    python_version: 3.9
   sklearn:
     code: null
     pickled_model: model.pkl

tutorials/get-started-notebooks/deploy/credit_defaults_model/conda.yaml

@@ -1,10 +1,10 @@
 channels:
 - conda-forge
 dependencies:
-- python=3.8.15
-- pip<=21.2.4
+- python=3.9
+- pip
 - pip:
-  - mlflow
+  - mlflow==2.17.2
   - cloudpickle==2.2.0
   - psutil==5.8.0
   - scikit-learn==0.24.2

tutorials/get-started-notebooks/deploy/credit_defaults_model/python_env.yaml

@@ -1,7 +1,7 @@
-python: 3.8.15
+python: 3.9
 build_dependencies:
-- pip==21.2.4
-- setuptools==59.8.0
-- wheel==0.38.4
+- pip==23.3.2
+- setuptools==69.0.3
+- wheel==0.42.0
 dependencies:
 - -r requirements.txt

tutorials/get-started-notebooks/deploy/credit_defaults_model/requirements.txt

@@ -1,4 +1,4 @@
-mlflow
+mlflow==2.17.2
 cloudpickle==2.2.0
 psutil==5.8.0
 scikit-learn==0.24.2