Bump kubernetes-client-bom from 5.12.3 to 5.12.4

[manusa]

Bump Kubernetes Client version for 2.13 branch (RHBQ?).

The patched version contains fixes to some of the reported problems regarding informers and their usage in operators.

I'm leaving it as a draft until the affected parties confirm that this should be merged.

/cc @metacosm @csviri @andreaTP @shawkins

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[metacosm]

Problem is I cannot complete a full JOSDK build (CI included) until this gets merged (native build won't work due to a missing method, see https://github.com/quarkiverse/quarkus-operator-sdk/actions/runs/3161338537 for more details). So while I think things are OK to be merged, I cannot be a 100% sure because CI doesn't fully pass until this is merged…

[metacosm]

I did verify locally that things build natively correctly with this PR, though.

[metacosm]

So I adapted the CI for the JOSDK extension so that it builds the relevant PR with this PR and everything went through OK so as far as I'm concerned, we're good to go! 🎉

[gsmet]

@manusa can you get this one out of draft before Tuesday evening then? Let's include it in Quarkus 2.13.1.Final.

[gsmet]

Ah wait. You targeted 2.13. You shouldn't do that. I will create another PR with your commit based on main.

[gsmet]

Ah no, that's me being confused, sorry :).

[gsmet]

And merged, thanks!