Bump jetty from 6.1.16 to 6.1.23 in /tcslackbuildnotifier-core#207

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dependabot/maven/tcslackbuildnotifier-core/org.mortbay.jetty-jetty-6.1.23PeteGoo/tcSlackBuildNotifier:dependabot/maven/tcslackbuildnotifier-core/org.mortbay.jetty-jetty-6.1.23Copy head branch name to clipboard