Simplify caching Maven artifact configuration in GitHub Workflows example

[apupier]

Since 2.3.0, the setup-java GitHub actions have a built-in cache mechanism which simplifies configuration of the workflow.

It will simplify this: https://github.com/com-pas/contributing/blob/e0e6ccbc2160d9ad05cf0dadea5faa33a977d8c1/docs/GITHUB_ACTIONS.md?plain=1#L147

relates to com-pas/contributing#62

User Story

As a com-pas maintainer

I want to have the simpler code to maintain

So that I can develop faster

Acceptance criteria

Please describe the initial acceptance critera.

Same feature level with less and simpler code