upgrade to latest junix socket dependency (2.2) #1174

As listed here:
https://github.com/docker-java/docker-java/pull/1159/files
the dependency was scaled up to a newer version, but not 2.2

As listed here:
bmuschko/gradle-docker-plugin#394

version 2.2 supports win10

So please upgrade once again from 2.0 to 2.2
as also commented here: https://github.com/docker-java/docker-java/pull/1159/files#r258316287