Merge pull request #1888 from jupyterhub/dependabot/pip/helm-chart/images/binderhub/tornado-6.4.2

chore(deps): bump tornado from 6.4.1 to 6.4.2 in /helm-chart/images/binderhub

Author: yuvipanda

helm-chart/images/binderhub/requirements.txt

@@ -178,7 +178,7 @@ sqlalchemy==2.0.31
     # via
     #   alembic
     #   jupyterhub
-tornado==6.4.1
+tornado==6.4.2
     # via
     #   -r ../../../requirements.txt
     #   jupyterhub