Upgrade to latest 2.11 with minimal Java 9 support.
<guava.version>18.0</guava.version>
<guice.version>3.0</guice.version>
<jetty.version>9.4.9.v20180320</jetty.version>
- <scala.version>2.11.4</scala.version> <!-- When updating this, the scala.major-version in parent must also be updated! -->
+ <scala.version>2.11.12</scala.version> <!-- When updating this, the scala.major-version in parent must also be updated! -->
<slf4j.version>1.7.5</slf4j.version>
<!-- These must be kept in sync with version used by current jersey2.version. -->
