Upgrade bazlets to latest stable-2.14 to build with 2.14.18 API

Change-Id: I47b6c7a49d1b09b505f16e9d282af2e499a93bb1

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 281df0a..1f3bd8a 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "714a32382ebd02919007d3514513af4395768d80",
+    commit = "2c39029a585bd1d5b785150948f162730f7b7e42",
     #local_path = "/home/<user>/projects/bazlets",
 )