Bump jetty-util from 8.2.0.v20160908 to 11.0.9

Bumps [jetty-util](https://github.com/eclipse/jetty.project) from 8.2.0.v20160908 to 11.0.9.
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-8.2.0.v20160908...jetty-11.0.9)

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-util
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

log4j-appserver/pom.xml

@@ -35,7 +35,7 @@
     <docLabel>Web Documentation</docLabel>
     <projectDir>/log4j-appserver</projectDir>
     <tomcat-juli.version>10.0.16</tomcat-juli.version>
-    <jetty.version>8.2.0.v20160908</jetty.version> <!--  Jetty 9 requires Java 8 -->
+    <jetty.version>11.0.9</jetty.version> <!--  Jetty 9 requires Java 8 -->
     <module.name>org.apache.logging.log4j.appserver</module.name>
     <maven.doap.skip>true</maven.doap.skip>
   </properties>