Update bazlets to latest stable-2.15 to use 2.15.1 API

Change-Id: I07bd89e765fe3dc5573e2561a51b969306bc9d0b
diff --git a/WORKSPACE b/WORKSPACE
index 34dbd7c..7eb9aae 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "92943361811e20b96f4c979992a0b384711c6456",
+    commit = "1419057b24e41cda9a6ee9d9c431b9005faf8190",
     #    local_path = "/home/<user>/projects/bazlets",
 )