Upgrade bazlets to latest stable-3.0 to build with 3.0.12 API

Change-Id: I2847c4068a26e3e6e9a3178e968bf7d7401be233

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index a0c4bc3..c0230ee 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "7a9ae377b519934c87184cc05845663ed708b69c",
+    commit = "6d2b8f41ed34dad925b767399d1e4be378abb029",
     #local_path = "/home/<user>/projects/bazlets",
 )