Bump jetty-server from 9.3.0.M1 to 9.3.27.v20190418#1

dependabot[bot] wants to merge 1 commit intomasterattester/robot-server:masterfrom

dependabot/maven/org.eclipse.jetty-jetty-server-9.3.27.v20190418attester/robot-server:dependabot/maven/org.eclipse.jetty-jetty-server-9.3.27.v20190418Copy head branch name to clipboard