Upgrade metrics-jmx to 4.0.5

This aligns with the version of metrics-core used in core Gerrit
on stable-2.15 and later.

Change-Id: Id6abf32ca28fa92a0c637bede68e0d4618106a1a

external_plugin_deps.bzl

diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 0e99761..c4d470a 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -3,6 +3,6 @@
 def external_plugin_deps():
     maven_jar(
         name = "metrics_jmx",
-        artifact = "io.dropwizard.metrics:metrics-jmx:4.0.3",
-        sha1 = "d49313634a606496433e34b733251ba9fdbb333f",
+        artifact = "io.dropwizard.metrics:metrics-jmx:4.0.5",
+        sha1 = "d7be4ddd7ba674ee8be1d23d883fb3ca68ee1d54",
     )