Update global-refdb to 3.3.2.1 and consume java8 flavor

Change-Id: Ia5269a9bf2b4c44a75782349935d02002f497b1e

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index e187d15..9af89f0 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -15,6 +15,6 @@
 
     maven_jar(
         name = "global-refdb",
-        artifact = "com.gerritforge:global-refdb:3.3.1",
-        sha1 = "5df9dddad2fc67c922406f41549186b210cd957e",
+        artifact = "com.gerritforge:global-refdb:3.3.2.1:jdk8",
+        sha1 = "7a293d577665dfc6f4d36371af21c4a3f7177b23",
     )