Merge pull request #2417 from Tenzer/urllib3-upper-limit

Set an upper limit on the urllib3 dependency

Author: k8s-ci-robot

requirements.txt

@@ -7,5 +7,5 @@ google-auth>=1.0.1  # Apache-2.0
 websocket-client>=0.32.0,!=0.40.0,!=0.41.*,!=0.42.* # LGPLv2+
 requests # Apache-2.0
 requests-oauthlib # ISC
-urllib3>=1.24.2  # MIT
+urllib3>=1.24.2,<2.4.0  # MIT
 durationpy>=0.7 # MIT