Bump org.eclipse.jetty.toolchain:jetty-test-helper from 5.9 to 6.2

Bumps [org.eclipse.jetty.toolchain:jetty-test-helper](https://github.com/eclipse/jetty.toolchain) from 5.9 to 6.2.
- [Commits](jetty/jetty-toolchain@jetty-test-helper-5.9...jetty-test-helper-6.2)

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

Signed-off-by: dependabot[bot] <[email protected]>

pom.xml

@@ -26,7 +26,7 @@
 
   <properties>
     <jdk.version.minimum>8</jdk.version.minimum>
-    <jetty-test-helper.version>5.9</jetty-test-helper.version>
+    <jetty-test-helper.version>6.2</jetty-test-helper.version>
     <jetty.git.repo>jetty-examples</jetty.git.repo>
     <jetty.version>9.4.53.v20231009</jetty.version>
   </properties>