chore(gradle): bump org.eclipse.jetty:jetty-bom from 11.0.20 to 12.0.15

Bumps [org.eclipse.jetty:jetty-bom](https://github.com/jetty/jetty.project) from 11.0.20 to 12.0.15.
- [Release notes](https://github.com/jetty/jetty.project/releases)
- [Commits](jetty/jetty.project@jetty-11.0.20...jetty-12.0.15)

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

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

gradle/libs.versions.toml

@@ -50,7 +50,7 @@ javax-inject = "1"
 javax-validation = "2.0.1.Final"
 jdom2 = "2.0.6.1"
 jetbrains = "26.0.1"
-jetty = "11.0.20"
+jetty = "12.0.15"
 jpy = "0.19.0"
 jsinterop = "2.0.2"
 # google is annoying, and have different versions released for the same groupId