Update event-broker to 3.4-alpha-20210205083200

Change-Id: Ifb4fae56b658281c7a5b102e801159b5a8878a7f

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 61d20ad..8716831 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -15,6 +15,6 @@
 
     maven_jar(
         name = "events-broker",
-        artifact = "com.gerritforge:events-broker:3.3.0-rc7",
-        sha1 = "5efe1c4a0f7c385b0ec95b8f9897248049c4173c",
+        artifact = "com.gerritforge:events-broker:3.4-alpha-20210205083200",
+        sha1 = "3fec2bfee13b9b0a2889616e3c039ead686b931f",
     )