Prevent failures in MySQLUnixDomainSocketTest

Like:

2024-09-26T14:00:19.4493986Z [ERROR] io.vertx.mysqlclient.MySQLUnixDomainSocketTest.connectWithVertxInstance -- Time elapsed: 0.016 s <<< ERROR!
2024-09-26T14:00:19.4496437Z java.util.concurrent.RejectedExecutionException: event executor terminated
2024-09-26T14:00:19.4500928Z 	at io.netty.util.concurrent.SingleThreadEventExecutor.reject(SingleThreadEventExecutor.java:1056)
Signed-off-by: Thomas Segismont <[email protected]>

Author: tsegismont

vertx-mysql-client/src/test/java/io/vertx/mysqlclient/MySQLUnixDomainSocketTest.java

@@ -52,13 +52,9 @@ public void setUp() {
   }
 
   @After
-  public void after(TestContext ctx) {
-    if (vertx != null) {
-      vertx.close().onComplete(ctx.asyncAssertSuccess());
-    }
-    if (client != null) {
-      client.close().onComplete(ctx.asyncAssertSuccess());
-    }
+  public void after() {
+    client.close().await();
+    vertx.close().await();
   }
 
   @Test