ci: use actions/cache@v4

[simPod]

Fixes CI failures

[greg0ire]

Should we do this with Dependabot instead?

[simPod]

Not instead of this PR since it has been already done but overall you can setup dependabot here, yes

[greg0ire]

Ah indeed, it needs to be unblocked first: #330

[greg0ire]

There are failing tests and pending checks, why is that?

[simPod]

there were updates in slevomat that found new errors

Pending checks are marked as required in repo but now those are run on 7.2, not 7.4

I resolved everything in #326 #327 already but review is stale there and meanwhile actions/cache@v2 stopped working...

I suggest to merge this even though checks are failing. Then continue with mentioned PRs.

[simPod]

It will need to be ported to 13.0.x too. Or let dependabot do it but also port #330 to v13. Idk on what branches it will run.

[greg0ire]

The config is run on the default branch, and will target the default branch.