feat: Update the default used Ubuntu version to 22.04

[ZPascal]

Release notes

Logstash Docker images now also work under Ubuntu 22.04.

What does this PR do?

• Updates the used Ubuntu version from 20.04 to 22.04

Why is it important/What is the impact to the user?

• The PR updates the ubuntu version to consume Jammy instead of Focal -> Longer LTS support

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files (and/or docker env variables)
• I have adapted tests that prove my fix is effective or that my feature works

Author TODO:

• Test the change locally

How to test this PR locally

1. Build the container locally
2. Execute the container related tests

[ZPascal]

I can't configure the labels of this PR, but it is an enhancement and should be shipped with the next minor version.

[ZPascal]

Before I start setting up my local environment, I would like to clarify how the community feels about updating the default LTS Ubuntu version.