Upgrade to current version (2.3.10.Final) of io.undertow:undertow-core

[rsearls]

Module kubernetes/kubernetes uses code from undertow-core. Currently
io.undertow:undertow-core is being held at version 1.3.33.Final in order
to enable the code to compile. This module references package
io/undertow/protocols/spdy which was removed from undertow-core starting in
version 1.4.0.Final. Replacement code needs to be added to module
kubernetes/kubernetes for the following classes.

io.undertow.protocols.spdy.SpdyStreamStreamSinkChannel
io.undertow.client.spdy.SpdyClientConnection
io.undertow.protocols.spdy.SpdyChannel
io.undertow.protocols.spdy.SpdyChannelWithoutFlowControl

This issue depends on #1270
being resolved first.
See tracker doc, #1279

[fabiobrz]

We have a number of dependantbot PRs about undertow.
And #1295, too.

This is to unbound this very issue from the scope of #1279, which is not blocked by it, and has been delivered already.

@rsearls feel free to push back in case you'd have any objections.