[moblab] Uprev the default build version to the lastest stable RC

TEST=None
BUG=None

Change-Id: I931b65cc1ea9b998e75fa27eb565a139098d0596
Reviewed-on: https://chromium-review.googlesource.com/526514
Commit-Ready: Keith Haddow <haddowk@chromium.org>
Tested-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Keith Haddow <haddowk@chromium.org>
Reviewed-by: Michael Tang <ntang@chromium.org>
diff --git a/moblab_config.ini b/moblab_config.ini
index 6f3a4fd..70c04ce 100644
--- a/moblab_config.ini
+++ b/moblab_config.ini
@@ -27,7 +27,7 @@
 cts_results_server:
 # In moblab, this paramater is empty and uses the image bucket by default.
 results_storage_server:
-stable_cros_version: R57-9202.66.0
+stable_cros_version: R59-9460.60.0
 
 # The pubsub topic the gs_offloader notification is sent to.
 cloud_notification_topic: projects/chromeos-partner-moblab/topics/moblab-notification