Upgrade bazlets to latest stable-3.0

To use the now mandatory https protocol for MAVEN_CENTRAL.

Bug: Issue 12170
Change-Id: I3886b1cd27c4d2a0edf42b504541e7f112370ef0

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 21cb155..da67f2d 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "99d51724c816dc25f03c8ca96126716298a6ee38",
+    commit = "8ac9d00b8f12b7f61ff360c47a5bd87d7f75f4b5",
     #local_path = "/home/<user>/projects/bazlets",
 )