Bugfix/also set key managers

[kungfoo]

Using the jdk-9 branch I discovered that one also needs to set the key managers so mutual TLS auth actually works (which makes sense, because the client also needs to provide it's client key, not only the cert).

I also took the liberty of updating all the dependencies to modern versions, since some contain bugs for jdk/jre-11, which I am running this on.

[kungfoo]

This is needed so that this library works with a new jdk/jre. Is this going anywhere?

[sonarqubecloud[bot]]

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