Bump undertow-core from 2.2.15.Final to 2.2.16.Final (#326)

Bumps [undertow-core](https://github.com/undertow-io/undertow) from 2.2.15.Final to 2.2.16.Final.
- [Release notes](https://github.com/undertow-io/undertow/releases)
- [Commits](undertow-io/undertow@2.2.15.Final...2.2.16.Final)

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

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

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

server/pom.xml

@@ -35,7 +35,7 @@
     <properties>
         <metrics.version>4.2.7</metrics.version>
         <slf4j-simple.version>1.7.35</slf4j-simple.version>
-        <undertow-core.version>2.2.15.Final</undertow-core.version>
+        <undertow-core.version>2.2.16.Final</undertow-core.version>
     </properties>
 
     <profiles>