Upgrade maven-site to 3.2.
Upgrade maven-site to 3.2.

mspiegel/metrics,signalfx/metrics,unitsofmeasurement/metrics,infusionsoft/yammer-metrics,dropwizard/metrics,ohr/metrics,egymgmbh/metrics,gburton1/metrics,mnuessler/metrics,tempredirect/metrics,mattnelson/metrics,Banno/metrics,thelastpickle/metrics,rexren/metrics,jplock/metrics,fcrepo4-archive/metrics,infusionsoft/yammer-metrics,AltitudeDigital/metrics,timezra/metrics,cirrus-dev/metrics,dropwizard/metrics,slachiewicz/metrics,valery1707/dropwizard-metrics,wfxiang08/metrics,bentatham/metrics,dropwizard/metrics,mtakaki/metrics,chenxianghua2014/metrics,slovdahl/metrics,ChetnaChaudhari/metrics,fcrepo4-archive/metrics,randomstatistic/metrics,mveitas/metrics,ind9/metrics,mt0803/metrics,gburton1/metrics,mveitas/metrics,kevintvh/metrics,jasw/metrics