Merge pull request jupyterhub#2759 from jupyterhub/dependabot/pip/urllib3-1.26.17

Bump urllib3 from 1.26.9 to 1.26.17

Author: manics

requirements.txt

@@ -83,7 +83,7 @@ six==1.16.0
     #   python-dateutil
 tomli==2.0.1
     # via pytest
-urllib3==1.26.9
+urllib3==1.26.17
     # via
     #   kubernetes
     #   requests