Remove iouring support from simple test client

This was a copy-paste job from the production event group config. We hit
on a test regression where netty threads on corretto 25 were failing to
be cleaned up on close. They were stuck in:

```
at io.netty.util.internal.CleanerJava25$CleanableDirectBufferImpl.clean(CleanerJava25.java:206)
```

This eventually caused tests to time out due to resource issues.

Signed-off-by: Robert Young <robertyoungnz@gmail.com>

Author: robobario

kroxylicious-integration-test-support/pom.xml

@@ -102,10 +102,6 @@
             <groupId>io.netty</groupId>
             <artifactId>netty-transport-classes-kqueue</artifactId>
         </dependency>
-        <dependency>
-            <groupId>io.netty</groupId>
-            <artifactId>netty-transport-classes-io_uring</artifactId>
-        </dependency>
         <dependency>
             <groupId>org.slf4j</groupId>
             <artifactId>slf4j-api</artifactId>

kroxylicious-integration-test-support/src/main/java/io/kroxylicious/test/client/EventGroupConfig.java

@@ -22,10 +22,6 @@
 import io.netty.channel.socket.SocketChannel;
 import io.netty.channel.socket.nio.NioServerSocketChannel;
 import io.netty.channel.socket.nio.NioSocketChannel;
-import io.netty.channel.uring.IoUring;
-import io.netty.channel.uring.IoUringIoHandler;
-import io.netty.channel.uring.IoUringServerSocketChannel;
-import io.netty.channel.uring.IoUringSocketChannel;
 
 public record EventGroupConfig(
                                Class<? extends SocketChannel> clientChannelClass,
@@ -35,11 +31,7 @@ public static EventGroupConfig create() {
         final Class<? extends SocketChannel> clientChannelClass;
         final Class<? extends ServerSocketChannel> serverChannelClass;
 
-        if (IoUring.isAvailable()) {
-            clientChannelClass = IoUringSocketChannel.class;
-            serverChannelClass = IoUringServerSocketChannel.class;
-        }
-        else if (Epoll.isAvailable()) {
+        if (Epoll.isAvailable()) {
             clientChannelClass = EpollSocketChannel.class;
             serverChannelClass = EpollServerSocketChannel.class;
         }
@@ -56,10 +48,7 @@ else if (KQueue.isAvailable()) {
 
     private static EventLoopGroup newGroup() {
         final IoHandlerFactory ioHandlerFactory;
-        if (IoUring.isAvailable()) {
-            ioHandlerFactory = IoUringIoHandler.newFactory();
-        }
-        else if (Epoll.isAvailable()) {
+        if (Epoll.isAvailable()) {
             ioHandlerFactory = EpollIoHandler.newFactory();
         }
         else if (KQueue.isAvailable()) {