update contributing guide and docs to recommend Python 3.11

Author: Ygnas

Diff for: CONTRIBUTING.md

@@ -6,7 +6,7 @@ Thank you for your interest in contributing to the CodeFlare SDK!
 
 ### Prerequisites
 
-- Python 3.9
+- Python 3.11
 - [Poetry](https://python-poetry.org/)
 
 ### Setting Up Your Development Environment

Diff for: docs/sphinx/user-docs/e2e.rst

@@ -4,7 +4,7 @@ Running e2e tests locally
 Pre-requisites
 ^^^^^^^^^^^^^^
 
--  We recommend using Python 3.9, along with Poetry.
+-  We recommend using Python 3.11, along with Poetry.
 
 On KinD clusters
 ----------------