Bump ubuntu from `eb1392b` to `40b84b7` in /release (#2245)

diff --git a/release/DOCKERFILE b/release/DOCKERFILE
index f5e26c6..9b763b6 100644
--- a/release/DOCKERFILE
+++ b/release/DOCKERFILE
@@ -1,4 +1,4 @@
-FROM ubuntu:bionic@sha256:eb1392bbdde63147bc2b4ff1a4053dcfe6d15e4dfd3cce29e9b9f52a4f88bc74
+FROM ubuntu:bionic@sha256:40b84b75884ff39e4cac4bf62cb9678227b1fbf9dbe3f67ef2a6b073aa4bb529
 RUN apt update
 RUN apt install -y git
 RUN git clone https://chromium.googlesource.com/chromium/tools/depot_tools.git