Update jetty-alpn-agent for latest java8 release.
Update jetty-alpn-agent for latest java8 release.

Motivation:

We need to update jetty-alpn-agent to support java 1.8.0_162 while running our tests / examples.

Modifications:

Update jetty-alpn-agent to 2.0.7

Result:

All tests alpn related tests work again on latest java8 version

fengjiachun/netty,andsel/netty,netty/netty,tbrooks8/netty,gerdriesselmann/netty,gerdriesselmann/netty,jchambers/netty,jchambers/netty,Squarespace/netty,artgon/netty,NiteshKant/netty,zer0se7en/netty,NiteshKant/netty,andsel/netty,Squarespace/netty,mikkokar/netty,doom369/netty,doom369/netty,zer0se7en/netty,fenik17/netty,zer0se7en/netty,jchambers/netty,Spikhalskiy/netty,mikkokar/netty,johnou/netty,ejona86/netty,ejona86/netty,gerdriesselmann/netty,tbrooks8/netty,ejona86/netty,fenik17/netty,Squarespace/netty,netty/netty,artgon/netty,fengjiachun/netty,jchambers/netty,tbrooks8/netty,zer0se7en/netty,fengjiachun/netty,andsel/netty,doom369/netty,zer0se7en/netty,artgon/netty,bryce-anderson/netty,NiteshKant/netty,NiteshKant/netty,johnou/netty,artgon/netty,NiteshKant/netty,jchambers/netty,andsel/netty,gerdriesselmann/netty,johnou/netty,andsel/netty,bryce-anderson/netty,fenik17/netty,netty/netty,Spikhalskiy/netty,tbrooks8/netty,Spikhalskiy/netty,doom369/netty,netty/netty,netty/netty,ejona86/netty,fengjiachun/netty,ejona86/netty,bryce-anderson/netty,gerdriesselmann/netty,johnou/netty,artgon/netty,tbrooks8/netty,johnou/netty,mikkokar/netty,bryce-anderson/netty,Spikhalskiy/netty,Squarespace/netty,Squarespace/netty,doom369/netty,mikkokar/netty,fenik17/netty,mikkokar/netty,Spikhalskiy/netty,fenik17/netty,fengjiachun/netty,bryce-anderson/netty