Bump jetty-jmx from 9.4.14.v20181114 to 9.4.31.v20200723#293

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dependabot/gradle/org.eclipse.jetty-jetty-jmx-9.4.31.v20200723ngocbd/pokerserver:dependabot/gradle/org.eclipse.jetty-jetty-jmx-9.4.31.v20200723Copy head branch name to clipboard