Merge pull request #3005 from jupyterhub/dependabot/pip/urllib3-1.26.19

Bump urllib3 from 1.26.18 to 1.26.19

Author: minrk

requirements.txt

@@ -85,7 +85,7 @@ six==1.16.0
     #   python-dateutil
 tomli==2.0.1
     # via pytest
-urllib3==1.26.18
+urllib3==1.26.19
     # via
     #   kubernetes
     #   requests