Merge branch 'audit' into 'master'

Update Dockerfile

See merge request learn-renku/teaching-on-renku/autograde!1

Dockerfile

 # For finding latest versions of the base image see
 # https://github.com/SwissDataScienceCenter/renkulab-docker
-ARG RENKU_BASE_IMAGE=renku/renkulab-vnc:771cc49
+ARG RENKU_BASE_IMAGE=renku/renkulab-vnc:0.10.1
 FROM ${RENKU_BASE_IMAGE}
 
 # Uncomment and adapt if code is to be included in the image