Bump jetty.version from 12.0.15 to 12.0.16

Bumps `jetty.version` from 12.0.15 to 12.0.16.

Updates `org.eclipse.jetty:jetty-bom` from 12.0.15 to 12.0.16
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-12.0.15...jetty-12.0.16)

Updates `org.eclipse.jetty.ee9:jetty-ee9-bom` from 12.0.15 to 12.0.16
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-12.0.15...jetty-12.0.16)

Updates `org.eclipse.jetty:jetty-maven` from 12.0.15 to 12.0.16

Updates `org.eclipse.jetty.ee9:jetty-ee9-maven-plugin` from 12.0.15 to 12.0.16

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty.ee9:jetty-ee9-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-maven
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty.ee9:jetty-ee9-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pom.xml

@@ -44,7 +44,7 @@
     <dollar>$</dollar>
     <openbracket>{</openbracket>
     <gitHubRepo>jenkinsci/${project.artifactId}</gitHubRepo>
-    <jetty.version>12.0.15</jetty.version>
+    <jetty.version>12.0.16</jetty.version>
     <!-- if we update this all consumers need to be running at least this version -->
     <maven.version>3.9.6</maven.version>
     <maven-plugin-tools.version>3.15.1</maven-plugin-tools.version>