Updating packages.

Ensuring cffi package for unit testing is updated. Causes breaks on CBL-Mariner at the older version.

testing/catalog_test_azure/requirements.txt

 msal==1.3.0
 certifi==2019.11.28
-cffi==1.14.0
+cffi==1.16.0
 chardet==3.0.4
 cryptography==2.8
 enum34==1.1.10