[Elasticsearch Dockerfiles] Ubuntu 20.04 EOL May 31, 2025

### Description

[Ubuntu 20.04 is EOL this May 31, 2025](https://ubuntu.com/blog/ubuntu-20-04-lts-end-of-life-standard-support-is-coming-to-an-end-heres-how-to-prepare)

As someone who depends on Elasticsearch Dockerfiles, it would be great to update the images to use Ubuntu 22 at least since it will be a security vulnerability for us to use a version of Ubuntu without LTS.