Upgrade javamelody-core to 1.80.0

The new release fixed some issues and made some improvements: [1].

[1] https://github.com/javamelody/javamelody/wiki/ReleaseNotes#1800

Change-Id: I474ce2131fdccf898652edfa54825ae8b9fe1051
diff --git a/external_plugin_deps.bzl b/external_plugin_deps.bzl
index 02099ff..863d1ab 100644
--- a/external_plugin_deps.bzl
+++ b/external_plugin_deps.bzl
@@ -3,8 +3,8 @@
 def external_plugin_deps():
     maven_jar(
         name = "javamelody-core",
-        artifact = "net.bull.javamelody:javamelody-core:1.79.0",
-        sha1 = "9413e29625402900e69feae8f1948ea694a88244",
+        artifact = "net.bull.javamelody:javamelody-core:1.80.0",
+        sha1 = "9499869f068a1e57efefa392a06b5a7635613359",
     )
 
     maven_jar(