Fix standalone build, reference plugin API 2.13.9

Change-Id: Iff537077876e68a24613908e8fe856506d5ee7f9
diff --git a/lib/gerrit/BUCK b/lib/gerrit/BUCK
index a197eb1..e879c99 100644
--- a/lib/gerrit/BUCK
+++ b/lib/gerrit/BUCK
@@ -1,7 +1,16 @@
 include_defs('//bucklets/maven_jar.bucklet')
 
-VER = '2.11-SNAPSHOT'
-REPO = MAVEN_LOCAL
+VER = '2.13.9'
+REPO = MAVEN_CENTRAL
+
+maven_jar(
+  name = 'acceptance-framework',
+  id = 'com.google.gerrit:gerrit-acceptance-framework:' + VER,
+  sha1 = '53a6e2baca19303bbf3967b861cf9814323c31f6',
+  license = 'Apache2.0',
+  attach_source = False,
+  repository = REPO,
+)
 
 maven_jar(
   name = 'plugin-api',