Bump undertow-core from 2.0.22.Final to 2.0.23.Final in /rts/at/undertow

Bumps [undertow-core](https://github.com/undertow-io/undertow) from 2.0.22.Final to 2.0.23.Final.
- [Release notes](https://github.com/undertow-io/undertow/releases)
- [Commits](undertow-io/undertow@2.0.22.Final...2.0.23.Final)

---
updated-dependencies:
- dependency-name: io.undertow:undertow-core
  dependency-type: direct:production
...

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

rts/at/undertow/pom.xml

@@ -28,7 +28,7 @@
     <properties>
         <version.narayana>5.12.1.Final-SNAPSHOT</version.narayana>
         <version.jboss.logging>3.1.4.GA</version.jboss.logging>
-        <undertow.io.version>2.0.22.Final</undertow.io.version>
+        <undertow.io.version>2.0.23.Final</undertow.io.version>
         <version.resteasy>3.0.23.Final</version.resteasy>
         <maven.compiler.source>1.8</maven.compiler.source>
         <maven.compiler.target>1.8</maven.compiler.target>