Merge pull request #1885 from jupyterhub/dependabot/pip/images/proxy-patches/urllib3-1.26.4

build(deps): bump urllib3 from 1.26.3 to 1.26.4 in /images/proxy-patches

Author: betatim

images/proxy-patches/requirements.txt

@@ -12,5 +12,5 @@ idna==2.10
     # via requests
 requests==2.25.1
     # via -r requirements.in
-urllib3==1.26.3
+urllib3==1.26.4
     # via requests