replace vertx-stack-depchain with vertx-dependencies

[michalszynkiewicz]

Currently we import vetrx-stack-depchain. vertx-stack-depchain's parent imports vertx-dependencies. This way we implicitly import vertx-dependencies.

This PR changes the import to vertx-dependencies to cut out the middleman

[gsmet]

Was it discussed with @cescoffier ? Because he's on PTO for a while and I'm not comfortable merging this without his blessing.

[michalszynkiewicz]

Clement thought of listing the dependencies from vertx-stack-depchain excplicitly in our bom, not to depend on vertx-dependencies at all.
We can probably get it in 1.7.1, let's wait for Clement

[gsmet]

It's either in CR1 or not in 1.7.

I really don't want to take any risk regarding that post CR1.

And IIRC, Clément is on PTO for 3 weeks.

[cescoffier]

We can proceed with that change.
Even if I'm not a big fan of using the "internal" BOM it's the one productized.

If it simplifies productization go for it.
The other solution would be to not use any BOM, which would avoid having users to rely on unsupported Vert.x modules but introduce version dilemma.

That being said... would prefer a rebase first :-)

[gsmet]

Validated by Clément.