Bump io.undertow:undertow-core from 2.3.19.Final to 2.3.20.Final

Bumps [io.undertow:undertow-core](https://github.com/undertow-io/undertow) from 2.3.19.Final to 2.3.20.Final.
- [Release notes](https://github.com/undertow-io/undertow/releases)
- [Commits](undertow-io/undertow@2.3.19.Final...2.3.20.Final)

---
updated-dependencies:
- dependency-name: io.undertow:undertow-core
  dependency-version: 2.3.20.Final
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -5,7 +5,7 @@ intellijPluginRepositoryRestClient = "2.0.49"
 kotlinxSerialization = "1.6.3"
 okhttp = "4.12.0"
 retrofit = "2.11.0"
-undertow = "2.3.19.Final"
+undertow = "2.3.20.Final"
 xmlutil = "0.86.3"
 
 # plugins