Bump events-broker version to 3.4.0-rc0

Change-Id: I41a006d64712c5f5b4af651b1dab57b0de584280
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index b219489..7242061 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -109,8 +109,8 @@
 
     maven_jar(
         name = "events-broker",
-        artifact = "com.gerritforge:events-broker:3.3.0-rc7",
-        sha1 = "5efe1c4a0f7c385b0ec95b8f9897248049c4173c",
+        artifact = "com.gerritforge:events-broker:3.4.0-rc0",
+        sha1 = "8c34c88103d4783eb4c4decde6d93541bc1cf064",
     )
 
     maven_jar(