Update Errai version from 2.4.1.Final to 2.4.3.Final

This new version is just for bug fixes, here a complete list them:
https://issues.jboss.org/browse/ERRAI-673?jql=project%20%3D%20ERRAI%20AND%20fixVersion%20in%20(%222.4.2.Final%22%2C%20%222.4.3.Final%22)

Note: ERRAI-671 - Build/Compilation hangs when running with only one CPU is very annoying, we see this error all the time on our CI and on our developer's machine as well.
Merge pull request #32 from porcelli/master

Update Errai version from 2.4.1.Final to 2.4.3.Final