PerfTiger119 hitting errors when importing azure.storage.blob

[LoopedBard3]

PerfTiger119 appears to be hitting errors importing azure.storage.blob:

Traceback (most recent call last):
  File "C:\h\w\AD00097E\w\A8140924\e\performance\scripts\benchmarks_ci.py", line 361, in <module>
    main(sys.argv[1:])
  File "C:\h\w\AD00097E\w\A8140924\e\performance\scripts\benchmarks_ci.py", line 349, in main
    import upload
  File "C:\h\w\AD00097E\w\A8140924\e\performance\scripts\upload.py", line 3, in <module>
    from azure.storage.blob import BlobClient, ContentSettings
  File "D:\python3\lib\site-packages\azure\storage\blob\__init__.py", line 11, in <module>
    from ._blob_client import BlobClient
  File "D:\python3\lib\site-packages\azure\storage\blob\_blob_client.py", line 24, in <module>
    from ._shared.encryption import generate_blob_encryption_data
  File "D:\python3\lib\site-packages\azure\storage\blob\_shared\encryption.py", line 15, in <module>
    from cryptography.hazmat.backends import default_backend
ValueError: source code string cannot contain null bytes

This is being seen only on this machine so far and can be found in the failing micro runs in these two pipeline runs:
https://dev.azure.com/dnceng/internal/_build/results?buildId=2463158&view=results https://dev.azure.com/dnceng/internal/_build/results?buildId=2463346&view=results

Taking it out of rotation so we can more fully investigate and to get the few runs green again. (dotnet/dnceng#2977)

FYI: @DrewScoggins @caaavik-msft