Bump jetty-server in /uima-ducc-parent

Bumps [jetty-server](https://github.com/eclipse/jetty.project) from 9.4.14.v20181114 to 9.4.17.v20190418.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.14.v20181114...jetty-9.4.17.v20190418)

Signed-off-by: dependabot[bot] <support@github.com>
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