Bumping litellm and Python dependencies to simplify dep mgmt.

.github/actions/setup-python-env/action.yml

@@ -9,7 +9,7 @@ inputs:
   python_version:
     description: 'Python version to use.'
     required: false
-    default: '3.9'
+    default: '3.10'
 
 runs:
   using: "composite"

README.md

@@ -11,7 +11,7 @@ Not Diamond is an AI model router that automatically determines which LLM is bes
 
 # Installation
 
-**Python**: Requires **Python 3.9+**. It’s recommended that you create and activate a [virtualenv](https://virtualenv.pypa.io/en/latest/) prior to installing the package. For this example, we'll be installing the optional additional `create` dependencies, which you can learn more about [here](https://notdiamond.readme.io/docs/model_select-vs-create).
+**Python**: Requires **Python 3.10+**. It’s recommended that you create and activate a [virtualenv](https://virtualenv.pypa.io/en/latest/) prior to installing the package. For this example, we'll be installing the optional additional `create` dependencies, which you can learn more about [here](https://notdiamond.readme.io/docs/model_select-vs-create).
 
 ```shell
 pip install notdiamond[create]

docs/source/intro.rst

@@ -16,7 +16,7 @@ Key features
 Installation
 ============
 
-**Python**: Requires **Python 3.9+**. It’s recommended that you create and activate a `virtualenv <https://virtualenv.pypa.io/en/latest/>`_ prior to installing the package. For this example, we'll be installing the optional additional `create` dependencies, which you can learn more about `here <https://notdiamond.readme.io/docs/model_select-vs-create>`_.
+**Python**: Requires **Python 3.10+**. It’s recommended that you create and activate a `virtualenv <https://virtualenv.pypa.io/en/latest/>`_ prior to installing the package. For this example, we'll be installing the optional additional `create` dependencies, which you can learn more about `here <https://notdiamond.readme.io/docs/model_select-vs-create>`_.
 
 .. code:: shell