Bump io.undertow:undertow-core in /integration-test/fixtures/jar-app (#330)

Bumps [io.undertow:undertow-core](https://github.com/undertow-io/undertow) from 2.3.12.Final to 2.3.14.Final.
- [Release notes](https://github.com/undertow-io/undertow/releases)
- [Commits](undertow-io/undertow@2.3.12.Final...2.3.14.Final)

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

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

Author: dependabot[bot]

integration-test/fixtures/jar-app/pom.xml

@@ -21,7 +21,7 @@
     <dependency>
       <groupId>io.undertow</groupId>
       <artifactId>undertow-core</artifactId>
-      <version>2.3.12.Final</version>
+      <version>2.3.14.Final</version>
     </dependency>
   </dependencies>