Update Dockerfile to use maven 3.9.9

docker/maven-build/Dockerfile

diff --git a/docker/maven-build/Dockerfile b/docker/maven-build/Dockerfile
index 2baabf0..f27e261 100644
--- a/docker/maven-build/Dockerfile
+++ b/docker/maven-build/Dockerfile
@@ -1,7 +1,7 @@
 FROM ubuntu:22.04
 
 MAINTAINER Olivier Lamy olamy@apache.org
-ARG MAVEN_VERSION=3.8.6
+ARG MAVEN_VERSION=3.9.9
 ARG USER_HOME_DIR="/root"
 
 # Default to UTF-8 file.encoding