Bump python libs, address insecure releases (#7550)

* Bump python libs, address insecure releases

Using
https://requires.io/github/mistercrunch/superset/requirements/?branch=apache_release_improv
to identify insecure, old releases we're using and bumping.

* redis <3.0

* fix new flakes

setup.py

@@ -97,15 +97,14 @@ setup(
         'python-dateutil',
         'python-dotenv',
         'python-geohash',
-        'pyyaml>=3.13',
-        'requests>=2.20.0',
+        'pyyaml>=5.1',
+        'requests>=2.22.0',
         'retry>=0.9.2',
         'selenium>=3.141.0',
         'simplejson>=3.15.0',
         'sqlalchemy>=1.3.1,<2.0',
-        'sqlalchemy-utils',
+        'sqlalchemy-utils>=0.33.2',
         'sqlparse',
-        'unicodecsv',
         'wtforms-json',
     ],
     extras_require={