Use a lower ratio for CI for timeout test

Author: vietj

src/test/java/io/vertx/core/http/HttpClientTimeoutTest.java

@@ -60,7 +60,7 @@ public void testConnectTimeoutDoesFire() throws Exception {
   @Test
   public void testConnectTimeoutDoesNotFire() throws Exception {
     int timeout = 3000;
-    int ratio = 80;
+    int ratio = 50;
     server.requestHandler(req -> {
       req.response().end();
     });