Adjust gerrit_api to 3.4.0-SNAPSHOT

Change-Id: I67f9e15fab6f7599edf13257f3e1bce362d64f40

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 8ceff93..d12c0f4 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -12,7 +12,7 @@
     "gerrit_api",
 )
 
-gerrit_api(version = "3.3.0-SNAPSHOT")
+gerrit_api(version = "3.4.0-SNAPSHOT")
 
 load("//:external_plugin_deps.bzl", "external_plugin_deps")