Bump event-broker to v3.4.0

Change-Id: I543b56fd15f41850104fae14e1c5638d7dd5ffbd
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index d26ffb9..9cbe4ba 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -45,8 +45,8 @@
 
     maven_jar(
         name = "events-broker",
-        artifact = "com.gerritforge:events-broker:3.4.0-rc2",
-        sha1 = "f72b4166e6d785fd1a41c997a4ffb14461dd7d87",
+        artifact = "com.gerritforge:events-broker:3.4.0",
+        sha1 = "031881f18def90f945b21c7aafda3a1ac95e89c8",
     )
 
     maven_jar(