Bump io.undertow:undertow-core from 2.3.17.Final to 2.3.18.Final

Bumps [io.undertow:undertow-core](https://github.com/undertow-io/undertow) from 2.3.17.Final to 2.3.18.Final.
- [Release notes](https://github.com/undertow-io/undertow/releases)
- [Commits](undertow-io/undertow@2.3.17.Final...2.3.18.Final)

---
updated-dependencies:
- dependency-name: io.undertow:undertow-core
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ intellijStructure = "3.287"
 intellijPluginRepositoryRestClient = "2.0.39"
 kotlinxSerializationJson = "1.6.3"
 retrofit = "2.11.0"
-undertow = "2.3.17.Final"
+undertow = "2.3.18.Final"
 xmlutil = "0.86.3"
 
 # plugins