Bump org.eclipse.jetty.ee8:jetty-ee8-maven-plugin (#436)

Bumps org.eclipse.jetty.ee8:jetty-ee8-maven-plugin from 12.0.16 to 12.0.18.

---
updated-dependencies:
- dependency-name: org.eclipse.jetty.ee8:jetty-ee8-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]

jasperreports/pom.xml

@@ -17,7 +17,7 @@
   <url>https://struts.apache.org/getting-started/jasper-reports-tutorial</url>
   <properties>
     <jasperreports.version>7.0.2</jasperreports.version>
-    <jetty-plugin.version>12.0.16</jetty-plugin.version>
+    <jetty-plugin.version>12.0.18</jetty-plugin.version>
   </properties>
 
   <dependencies>