Bump jetty-server in /exampleProjects/logback
Bump jetty-server in /exampleProjects/logback

Bumps [jetty-server](https://github.com/eclipse/jetty.project) from 9.4.17.v20190418 to 9.4.35.v20201120.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.17.v20190418...jetty-9.4.35.v20201120)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@github.com>
ajozwik/mvn2sbt