Update to latest bazlets on stable-2.15

Change-Id: If561244b71977c63a2744553e44d6adbc0fef0ab
diff --git a/WORKSPACE b/WORKSPACE
index c572f0c..97a3123 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "cbddbc2b9571b1d692fb823ba8791ccd60b52421",
+    commit = "d9abef15db0f934bfe9adcb40b0c475807fd12bf",
     #    local_path = "/home/<user>/projects/bazlets",
 )