Bug in azure-devops triggers exception

[bmc-msft]

The Azure Devops python SDK needs to be upgraded to at least 6.0.0b4 to address include a fixe for a race-condition (see microsoft/azure-devops-python-api#356) that can manifest as the following exception:

Exception while executing function: Functions.notifications Result: Failure
Exception: FileExistsError: [Errno 17] File exists: '/home/.azure-devops/python-sdk/cache'
Stack:   File "/azure-functions-host/workers/python/3.7/LINUX/X64/azure_functions_worker/dispatcher.py", line 270, in _handle__function_load_request
    func_request.metadata.entry_point)
  File "/azure-functions-host/workers/python/3.7/LINUX/X64/azure_functions_worker/utils/wrappers.py", line 32, in call
    return func(*args, **kwargs)
  File "/azure-functions-host/workers/python/3.7/LINUX/X64/azure_functions_worker/loader.py", line 76, in load_function
    mod = importlib.import_module(fullmodname)
  File "/usr/local/lib/python3.7/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 953, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1006, in _gcd_import
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 677, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 728, in exec_module
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "/home/site/wwwroot/notifications/__init__.py", line 14, in <module>
    from ..onefuzzlib.notifications.main import Notification
  File "/home/site/wwwroot/onefuzzlib/notifications/main.py", line 30, in <module>
    from .ado import notify_ado
  File "/home/site/wwwroot/onefuzzlib/notifications/ado.py", line 9, in <module>
    from azure.devops.connection import Connection
  File "/home/site/wwwroot/.python_packages/lib/site-packages/azure/devops/connection.py", line 9, in <module>
    from ._file_cache import RESOURCE_CACHE as RESOURCE_FILE_CACHE
  File "/home/site/wwwroot/.python_packages/lib/site-packages/azure/devops/_file_cache.py", line 122, in <module>
    DEFAULT_CACHE_DIR = get_cache_dir()
  File "/home/site/wwwroot/.python_packages/lib/site-packages/azure/devops/_file_cache.py", line 117, in get_cache_dir
    os.makedirs(azure_devops_cache_dir)
  File "/usr/local/lib/python3.7/os.py", line 223, in makedirs
    mkdir(name, mode)