Here are the steps you'll need to take to get your project running after you update:
Errai's custom jetty launcher (org.jboss.errai.cdi.erver.gwt.JettyLauncher) is no longer needed and has been deleted. Simply remove the corresponding -server parameter from your GWT launch configuration if you still use it.
The whole artifact errai-cdi-jetty has been deleted and is no longer required. Delete the JAR file from your project or remove the corresponding dependency in your pom.xml