Updates to latest LTS Java 21 and recent maven

[codefromthecrypt]

This updates to the latest LTS version of Java 21.

This also updates maven as it has drifted a while, and removes a jlink workaround that seems no longer necessary.

from my mac silicon after running build per README

$ docker run --rm openzipkin/java:test -version
openjdk version "21.0.1" 2023-10-17
OpenJDK Runtime Environment (build 21.0.1+12-alpine-r0)
OpenJDK 64-Bit Server VM (build 21.0.1+12-alpine-r0, mixed mode, sharing)
$ docker run --rm --entrypoint /bin/sh openzipkin/java:test -c 'mvn -version'
Apache Maven 3.9.6 (bc0240f3c744dd6b6ec2920b3cd08dcc295161ae)
Maven home: /java/maven
Java version: 21.0.1, vendor: Alpine, runtime: /usr/lib/jvm/java-21-openjdk
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "6.5.0-10-generic", arch: "aarch64", family: "unix"

cc @NishikantThorat we can try your ppc64le after this, though there may be other problems in the downstream images (zipkin uses the base to test elasticsearch etc, and also we may be moving off alpine anyway). In other words, I'm not sure if folks besides you will be able to support it.

Marking draft until openzipkin/docker-alpine#35

[codefromthecrypt]

openzipkin/zipkin#3606 matches this version of maven

[codefromthecrypt]

thanks for the look @anuraaga!