gs: update to 4.19

BUG=None
TEST=`./cbuildbot/run_tests` passes
TEST=`./gs_unittest --network` passes
TEST=`./gslock_unittest --network` passes

Change-Id: I2c81ed927785d28e6b401d823bdf40de857f2a4d
Reviewed-on: https://chromium-review.googlesource.com/345920
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Don Garrett <dgarrett@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/2342680
Reviewed-by: Mike Frysinger <vapier@chromium.org>
diff --git a/lib/gs.py b/lib/gs.py
index 2272804..3b06491 100644
--- a/lib/gs.py
+++ b/lib/gs.py
@@ -253,7 +253,7 @@
   # (1*sleep) the first time, then (2*sleep), continuing via attempt * sleep.
   DEFAULT_SLEEP_TIME = 60
 
-  GSUTIL_VERSION = '4.18'
+  GSUTIL_VERSION = '4.19'
   GSUTIL_TAR = 'gsutil_%s.tar.gz' % GSUTIL_VERSION
   GSUTIL_URL = (PUBLIC_BASE_HTTPS_URL +
                 'chromeos-mirror/gentoo/distfiles/%s' % GSUTIL_TAR)