[Security] Bump jetty-server from 9.3.1.v20150714 to 9.4.15.v20190215#14

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dependabot/gradle/org.eclipse.jetty-jetty-server-9.4.15.v20190215Team-IO/Launcher:dependabot/gradle/org.eclipse.jetty-jetty-server-9.4.15.v20190215Copy head branch name to clipboard