8368630: java/net/httpclient/http3/H3ServerPushTest.java succeeds but fails in jtreg timeout

Reviewed-by: syan, jpai

Author: dfuch

test/jdk/java/net/httpclient/http3/H3ServerPushTest.java

@@ -78,7 +78,7 @@
  *          /test/lib
  * @build jdk.httpclient.test.lib.http2.Http2TestServer
  *        jdk.test.lib.net.SimpleSSLContext
- * @run junit H3ServerPushTest
+ * @run junit/othervm/timeout=240 H3ServerPushTest
  */
 
 /**