Bump org.eclipse.jetty:jetty-util in /log4j-appserver

Bumps org.eclipse.jetty:jetty-util from 9.4.56.v20240826 to 9.4.57.v20241219.

---
updated-dependencies:
- dependency-name: org.eclipse.jetty:jetty-util
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

log4j-appserver/pom.xml

@@ -54,7 +54,7 @@
     </bnd-extra-module-options>
 
     <!-- Dependencies unique for this module -->
-    <jetty.version>9.4.56.v20240826</jetty.version>
+    <jetty.version>9.4.57.v20241219</jetty.version>
     <tomcat-juli.version>10.0.27</tomcat-juli.version>
   </properties>