chore(deps): bump org.eclipse.jetty:jetty-util from 12.0.17 to 12.0.18 (#302)

Bumps org.eclipse.jetty:jetty-util from 12.0.17 to 12.0.18.

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

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Author: dependabot[bot]

plc4j/tools/opcua-server/pom.xml

@@ -89,7 +89,7 @@
     <dependency>
       <groupId>org.eclipse.jetty</groupId>
       <artifactId>jetty-util</artifactId>
-      <version>12.0.17</version>
+      <version>12.0.18</version>
     </dependency>
 
     <dependency>