Bump jetty.version from 9.4.17.v20190418 to 9.4.34.v20201102 (#12149) (#12160)

Bump jetty.version from 9.4.17.v20190418 to 9.4.34.v20201102 (#12149) (#12160)

Bumps `jetty.version` from 9.4.17.v20190418 to 9.4.34.v20201102.

Updates `jetty-server` from 9.4.17.v20190418 to 9.4.34.v20201102
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.34.v20201102)

Updates `jetty-servlets` from 9.4.17.v20190418 to 9.4.34.v20201102
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.34.v20201102)

Updates `websocket-server` from 9.4.17.v20190418 to 9.4.34.v20201102

Updates `jetty-webapp` from 9.4.17.v20190418 to 9.4.34.v20201102
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.34.v20201102)

Updates `jetty-util` from 9.4.17.v20190418 to 9.4.34.v20201102
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.34.v20201102)

Updates `jetty-proxy` from 9.4.17.v20190418 to 9.4.34.v20201102
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.34.v20201102)

Updates `jetty-maven-plugin` from 9.4.17.v20190418 to 9.4.34.v20201102
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.34.v20201102)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>