Bump jettyVersion from 9.4.25.v20191220 to 9.4.26.v20200117
Bump jettyVersion from 9.4.25.v20191220 to 9.4.26.v20200117

Bumps `jettyVersion` from 9.4.25.v20191220 to 9.4.26.v20200117.

Updates `jetty-server` from 9.4.25.v20191220 to 9.4.26.v20200117
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.25.v20191220...jetty-9.4.26.v20200117)

Updates `jetty-servlet` from 9.4.25.v20191220 to 9.4.26.v20200117
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.25.v20191220...jetty-9.4.26.v20200117)

Updates `jetty-servlets` from 9.4.25.v20191220 to 9.4.26.v20200117
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-9.4.25.v20191220...jetty-9.4.26.v20200117)

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