git: openjdk/loom: fibers: decrease number of threads in SuspendResume* tests from 30 to 20

[duke]

Changeset: 6b36f11f
Author:    Serguei Spitsyn <serguei.spitsyn at oracle.com>
Date:      2021-08-20 04:43:45 +0000
URL:       https://git.openjdk.java.net/loom/commit/6b36f11f2951304a97aceb896b41db9f22a4696b

decrease number of threads in SuspendResume* tests from 30 to 20

! test/hotspot/jtreg/serviceability/jvmti/vthread/SuspendResume1/SuspendResume1.java
! test/hotspot/jtreg/serviceability/jvmti/vthread/SuspendResume2/SuspendResume2.java