Upgrade metrics-jmx to 4.0.3

To match the version of metrics-core used in gerrit since
2.14.11.

Change-Id: I61fab18ad28d3e3302c96ee13ae5dc6345f6bc40
1 file changed
tree: 5b163bc91b32334861374d8015711134827facf9
  1. BUILD
  2. external_plugin_deps.bzl
  3. src/