Upgrade bazlets to latest stable-3.0

To use the now mandatory https protocol for MAVEN_CENTRAL.

Bug: Issue 12170
Change-Id: I1235d3f3b2bc28d48af8cab7ddfeef835ef31cb3

WORKSPACE

diff --git a/WORKSPACE b/WORKSPACE
index 6ed7a1a..6aed84b 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",
 )