Merge pull request #1125 from mathbunnyru/asalikhov/u20_0703

Update ubuntu image

Author: parente

base-notebook/Dockerfile

@@ -4,7 +4,7 @@
 # Ubuntu 20.04 (focal)
 # https://hub.docker.com/_/ubuntu/?tab=tags&name=focal
 # OS/ARCH: linux/amd64
-ARG ROOT_CONTAINER=ubuntu:focal-20200606@sha256:93fd0705706e5bdda6cc450b384d8d5afb18fecc19e054fe3d7a2c8c2aeb2c83
+ARG ROOT_CONTAINER=ubuntu:focal-20200703@sha256:d5a6519d9f048100123c568eb83f7ef5bfcad69b01424f420f17c932b00dea76
 
 ARG BASE_CONTAINER=$ROOT_CONTAINER
 FROM $BASE_CONTAINER