[autotest] Update Repair image version to R30-4537.38.0

BUG=chromium:286584
TEST=None

Change-Id: I4cb370d58b30f988f60bfb2777ae37554b1a6d99
Reviewed-on: https://chromium-review.googlesource.com/169328
Reviewed-by: Richard Barnette <jrbarnette@chromium.org>
Commit-Queue: Fang Deng <fdeng@chromium.org>
Tested-by: Fang Deng <fdeng@chromium.org>
diff --git a/global_config.ini b/global_config.ini
index 9dedf31..e39c121 100644
--- a/global_config.ini
+++ b/global_config.ini
@@ -144,7 +144,7 @@
 serve_packages_from_autoserv: True
 
 [CROS]
-stable_cros_version: R28-4100.7.0
+stable_cros_version: R30-4537.38.0
 stable_build_pattern: %s-release/%s
 # The zone that all Chrome OS devices are in if they are in a lab.
 dns_zone: cros.corp.google.com