Bump jetty-webapp from 9.4.12.v20180830 to 9.4.34.v20201102

Bumps [jetty-webapp](https://github.com/eclipse/jetty.project) from 9.4.12.v20180830 to 9.4.34.v20201102.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-9.4.12.v20180830...jetty-9.4.34.v20201102)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-webapp
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -14,7 +14,7 @@
         <scala.version>2.11</scala.version>
         <scala.compiler>2.11.8</scala.compiler>
         <lift.version>2.6.3</lift.version>
-        <jetty.version>9.4.12.v20180830</jetty.version>
+        <jetty.version>9.4.34.v20201102</jetty.version>
         <!-- Common plugin settings -->
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
         <project.reporting.outputEncoding>${project.build.sourceEncoding}</project.reporting.outputEncoding>