Update urllib3 dependency

Author: mdmintz

requirements.txt

@@ -8,7 +8,7 @@ nose==1.3.7
 ipdb==0.13.2
 idna==2.9
 chardet==3.0.4
-urllib3==1.25.8
+urllib3==1.25.9
 requests==2.23.0
 selenium==3.141.0
 pluggy==0.13.1

setup.py

@@ -90,7 +90,7 @@
         'ipdb',
         'idna==2.9',  # Must stay in sync with "requests"
         'chardet==3.0.4',  # Must stay in sync with "requests"
-        'urllib3==1.25.8',  # Must stay in sync with "requests"
+        'urllib3==1.25.9',  # Must stay in sync with "requests"
         'requests==2.23.0',
         'selenium==3.141.0',
         'pluggy==0.13.1',