Bump jetty-maven-plugin from 9.4.0.v20161208 to 9.4.21.v20190926#122

dependabot-preview[bot] wants to merge 1 commit intodevelopCSUC/ECHOES-Tools:developfrom

dependabot/maven/develop/org.eclipse.jetty-jetty-maven-plugin-9.4.21.v20190926CSUC/ECHOES-Tools:dependabot/maven/develop/org.eclipse.jetty-jetty-maven-plugin-9.4.21.v20190926Copy head branch name to clipboard