Ensure azure namespace is established in 3.9 (#869)

Author: Hazhzeng

pack/templates/nix_env_gen.yml

@@ -12,10 +12,7 @@ steps:
   inputs:
     disableAutoCwd: true
     scriptPath: 'pack/scripts/nix_deps.sh'
-# The following task is disabled since Python 3.9 to fix azure/ namespace
-# https://github.com/Azure/azure-functions-python-worker/pull/854
 - task: CopyFiles@2
-  condition: and(succeeded(), in(variables['pythonVersion'], '3.6', '3.7', '3.8'))
   inputs:
     contents: |
       pack/utils/__init__.py

pack/templates/win_env_gen.yml

@@ -12,10 +12,7 @@ steps:
 - task: PowerShell@2
   inputs:
     filePath: 'pack\scripts\win_deps.ps1'
-# The following task is disabled since Python 3.9 to fix azure/ namespace
-# https://github.com/Azure/azure-functions-python-worker/pull/854
 - task: CopyFiles@2
-  condition: and(succeeded(), in(variables['pythonVersion'], '3.6', '3.7', '3.8'))
   inputs:
     contents: |
       pack\utils\__init__.py