Bump ubuntu from e4771b7 to eb1392b in /dev/ci/docker_linux (#110534)

Author: dependabot[bot]

dev/ci/docker_linux/Dockerfile

@@ -12,7 +12,7 @@
 
 # Last manual update 2021-09-24 (changing this comment will re-build image)
 
-FROM ubuntu:bionic@sha256:e4771b7160543c6e43968b4e9795be9ddcad9d573edd7cd7aebd3ce61326fc7a
+FROM ubuntu:bionic@sha256:eb1392bbdde63147bc2b4ff1a4053dcfe6d15e4dfd3cce29e9b9f52a4f88bc74
 MAINTAINER Flutter Developers <[email protected]>
 
 RUN apt-get update -y && \