cache maven dependencies

[jburel]

This indicates to use the maven cache.
See https://github.com/actions/setup-java#caching-packages-dependencies

[sbesson]

I am a bit unclear about the idea of caching dependencies. ome/openmicroscopy#6324 has certainly demonstrated that some of our components require testing with a populated cache although it might be limited to this specific component and the usage of the Ivy dependency system.

On the flip side, we want some coverage for building individual components from a clean state to detect dependency issues (like in the case of ome/omero-model#80). What is the primary benefit of activating the Java cache and where would you see it being used?

[jburel]

actually I opened it and tested it. It did not do what I was expecting;
Closing this PR