Bump kafka-clients version to 2.1.0

Change-Id: I2adc2ae8b70a7925562f69fd67f463ca4803f1f8
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index ccdbbaa..bebcc4e 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -3,8 +3,8 @@
 def external_plugin_deps():
     maven_jar(
         name = "kafka_client",
-        artifact = "org.apache.kafka:kafka-clients:0.10.0.1",
-        sha1 = "36ebf4044d0e546bf74c95629d736ca63320a323",
+        artifact = "org.apache.kafka:kafka-clients:2.1.0",
+        sha1 = "34d9983705c953b97abb01e1cd04647f47272fe5",
     )
 
     maven_jar(