Upgrade bazlets to latest stable-3.0 to build with 3.0.11 API

Change-Id: I5744c426906a09183d8d6ed742304e3d511bfba8

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 19347bd..122b744 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "2629e3802493a45cdc7a3e03deb3331743daa09c",
+    commit = "7a9ae377b519934c87184cc05845663ed708b69c",
     #local_path = "/home/<user>/projects/bazlets",
 )