Update to latest bazlets on stable-2.14 branch

Includes the following fixes needed to build reviewers on
stable-2.14:

- Use API version 2.14.6
- Strip GWT library to fix compilation in standalone mode

Change-Id: Ie54b12c8d1c55c166a70c6d0f27d825e36861608
diff --git a/WORKSPACE b/WORKSPACE
index b3bbd35..cd9ae96 100644
--- a/WORKSPACE
+++ b/WORKSPACE
@@ -3,7 +3,7 @@
 load("//:bazlets.bzl", "load_bazlets")
 
 load_bazlets(
-    commit = "e57da7c1ddde1389c15c86154a2ac4019099b050",
+    commit = "fb374c7a27fd94b94e5109906c09bc459355cff2",
     #    local_path = "/home/<user>/projects/bazlets",
 )