Update dependency org.eclipse.jetty:jetty-server to v12.1.4 (#523)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

languages/jvm/java.com/services/javalin.io/build.gradle

@@ -35,7 +35,7 @@ dependencies {
     implementation 'io.javalin:javalin:6.7.0'
 
     // ⚙️ Jetty server (already included, but explicitly pinned for stability)
-    implementation 'org.eclipse.jetty:jetty-server:12.1.3'
+    implementation 'org.eclipse.jetty:jetty-server:12.1.4'
 
     // 🧠 Logging (SLF4J + Simple)
     implementation 'org.slf4j:slf4j-simple:2.0.17'