update pub to latest

BUG=
[email protected]

Review-Url: https://codereview.chromium.org/2903723002 .

Author: jakemac53

DEPS

@@ -95,7 +95,7 @@ vars = {
   "ply_rev": "@604b32590ffad5cbb82e4afef1d305512d06ae93",
   "pool_tag": "@1.3.0",
   "protobuf_tag": "@0.5.4",
-  "pub_rev": "@be3d4d8be30f11fb9188d7f69434e884d4843c68",
+  "pub_rev": "@492372c4546c5a1a8b45891f956d2b2e98221fb0",
   "pub_semver_tag": "@1.3.2",
   "quiver_tag": "@0.22.0",
   "resource_rev":"@a49101ba2deb29c728acba6fb86000a8f730f4b1",