Bump up events-broker version to 3.6.0-rc3

Change-Id: Ia2505507b57fb915311ba069c9b272fc1c6a1564
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index d0720b6..760f2aa 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:3.5.0-alpha-202108041529",
-        sha1 = "309fe8cc08c46593d9990d4e5c448cc85e5a62b0",
+        artifact = "com.gerritforge:events-broker:3.6.0-rc3",
+        sha1 = "cb398afa4f76367be5c62b99a7ffce74ae1d3d8b",
     )
 
     TESTCONTAINERS_VERSION = "1.15.3"