Upgrade bazlets to latest master to build with 2.16-rc3 API

Change-Id: I568104da37e25a9a0c4d8a1049cbf108569c892f
diff --git a/WORKSPACE b/WORKSPACE
index 5e4a849..2f5722d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "7ce9a3f58f030635b3a1229b7fb4c62ee7979bc8",
+    commit = "d044cd60d37e302d9ac324f7a2c4e48b4011d4e6",
     # local_path = "/home/<user>/projects/bazlets",
 )