Bump jettyVersion from 11.0.6 to 11.0.9 in /Plan (#2437)

Bumps `jettyVersion` from 11.0.6 to 11.0.9.

Updates `jetty-server` from 11.0.6 to 11.0.9
- [Release notes](https://github.com/eclipse/jetty.project/releases)
- [Commits](https://github.com/eclipse/jetty.project/compare/jetty-11.0.6...jetty-11.0.9)

Updates `jetty-alpn-java-server` from 11.0.6 to 11.0.9

Updates `http2-server` from 11.0.6 to 11.0.9

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-server
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty:jetty-alpn-java-server
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.eclipse.jetty.http2:http2-server
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Plan/build.gradle

@@ -81,7 +81,7 @@ subprojects {
         commonsCodecVersion = "1.15"
         caffeineVersion = "3.1.1"
         mysqlVersion = "8.0.29"
-        jettyVersion = "11.0.6"
+        jettyVersion = "11.0.9"
         caffeineVersion = "2.9.2"
         mysqlVersion = "8.0.26"
         sqliteVersion = "3.36.0.3"