Upgrade metrics-graphite to 4.0.7

This aligns with the version used in core Gerrit's stable-3.1 branch.

Bug: Issue 12671
Change-Id: I65457e421b47f2672b9b4e78b36a4a58900468ee
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index a40f014..5c6a513 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -3,6 +3,6 @@
 def external_plugin_deps():
     maven_jar(
         name = "metrics_graphite",
-        artifact = "io.dropwizard.metrics:metrics-graphite:4.0.5",
-        sha1 = "76e8758356373d5aed5abacbda429b38f6e8fa98",
+        artifact = "io.dropwizard.metrics:metrics-graphite:4.0.7",
+        sha1 = "1b4f638d8d7474345337f2cb12da5c56ed4443b7",
     )