Remove commons:lang3 and use the one from core

The commons:lang3 dependency is now part of the standard
dependencies and therefore does not need to be explicitly
mentioned in the plugin's BUILD file.

Change-Id: I257eb6ccc7feafd5686b189341475d0ebfdb0607

BUILD

diff --git a/BUILD b/BUILD
index c206225..bad06dc 100644
--- a/BUILD
+++ b/BUILD
@@ -13,9 +13,6 @@
         "Implementation-URL: https://gerrit-review.googlesource.com/#/admin/projects/plugins/plugin-manager",
     ],
     resources = glob(["src/main/resources/**/*"]),
-    deps = PLUGIN_DEPS + [
-        "@commons-lang3//jar",
-    ],
 )
 
 junit_tests(