Bump jetty.version from 9.4.27.v20200227 to 9.4.28.v20200408 (#3250)
Bump jetty.version from 9.4.27.v20200227 to 9.4.28.v20200408 (#3250)

Bumps `jetty.version` from 9.4.27.v20200227 to 9.4.28.v20200408.

Updates `jetty-bom` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Updates `jetty-servlet` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Updates `jetty-http` from 9.4.27.v20200227 to 9.4.28.v20200408
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.27.v20200227...jetty-9.4.28.v20200408)

Signed-off-by: dependabot-preview[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>

Co-authored-by: dependabot-preview[bot] <6a4c1c4838f800d1998274cd5234e1f65c55e90c@users.noreply.github.com>
dropwizard/dropwizard,micsta/dropwizard,Alexey1Gavrilov/dropwizard,pkwarren/dropwizard,micsta/dropwizard,mosoft521/dropwizard,mosoft521/dropwizard,Alexey1Gavrilov/dropwizard,phambryan/dropwizard,dropwizard/dropwizard,pkwarren/dropwizard,phambryan/dropwizard,Alexey1Gavrilov/dropwizard,dropwizard/dropwizard,micsta/dropwizard,phambryan/dropwizard,mosoft521/dropwizard,pkwarren/dropwizard