chore(build): suppress JVM warnings for Netty and ByteBuddy/Mockito in Java 21+

- Added `--add-opens=java.base/java.nio=ALL-UNNAMED` to suppress Netty warnings.
- Enabled `-XX:+EnableDynamicAgentLoading` to address ByteBuddy/Mockito warnings.

Signed-off-by: Stefan Mogeritsch <stefan.mo.co@gmail.com>

build.gradle.kts

@@ -71,6 +71,10 @@ subprojects {
     }
     // Configure CDS in auto-mode to prevent bootstrap classpath warnings
     jvmArgs("-Xshare:auto", "-Djdk.instrument.traceUsage=false")
+    // Suppress Netty sun.misc.Unsafe warnings (transitiv via Spring Boot / Kafka)
+    jvmArgs("--add-opens=java.base/java.nio=ALL-UNNAMED")
+    // Suppress ByteBuddy/Mockito dynamic agent loading warnings (Java 21+)
+    jvmArgs("-XX:+EnableDynamicAgentLoading")
     // Increase test JVM memory with a stable configuration
     minHeapSize = "512m"
     maxHeapSize = "2g"
@@ -124,6 +128,8 @@ subprojects {
       shouldRunAfter("test")
       // Keep the same JVM settings for consistency
       jvmArgs("-Xshare:auto", "-Djdk.instrument.traceUsage=false")
+      jvmArgs("--add-opens=java.base/java.nio=ALL-UNNAMED")
+      jvmArgs("-XX:+EnableDynamicAgentLoading")
       maxHeapSize = "2g"
       dependsOn("testClasses")
     }