Update old references to Python 3.6 to 3.9 (#553)

* Update old references to Python 3.6 to 3.9

Author: andystaples

.github/workflows/durable_python_action.yml

@@ -12,10 +12,10 @@ jobs:
 
     steps:
     - uses: actions/checkout@v1
-    - name: Set up Python 3.6.x
+    - name: Set up Python 3.9.x
       uses: actions/setup-python@v1
       with:
-        python-version: 3.6.x
+        python-version: 3.9.x
     - name: Install dependencies
       run: |
         python -m pip install --upgrade pip

CONTRIBUTING.md

@@ -24,7 +24,7 @@ Thank you for taking the time to contribute to Durable Functions in [Python](htt
     - MacOS (or) Windows10 Ubuntu WSL
 - Language Runtimes
     - .NET Core 2.0
-    - \>= Python 3.6.x
+    - \>= Python 3.9.x
 
 Note: Some ML libraries may not be compatible with newer Python versions. Make sure the library is compatible with the Python version.
 

setup.py

@@ -52,7 +52,7 @@ def run(self, *args, **kwargs):
         'Development Status :: 5 - Production/Stable',
     ],
     license='MIT',
-    python_requires='>=3.6,<4',
+    python_requires='>=3.9,<4',
     install_requires=[
         'azure-functions>=1.12.0',
         'aiohttp>=3.6.2',