roll: third_party/pigweed roll: gn

From git_revision:7a8aa3a08a13521336853a28c46537ec04338a2d
To git_revision:18602f6cf1168cf78302024043edc02e8bad2ffb

Roll-Count: 1
GitWatcher: ignore
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/276216
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Original-Revision: a02d053a6f732603f57ef1bfbe4b83279cf89874

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 6fd6d5666f52eb..a02d053a6f7326
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8720186742527192193
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If833c3672500e8e7ab5181a9d751ad61b644a7e7
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/276168
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 6fd6d56..a02d053 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6fd6d5666f52eb394ba49a5d77aafe7123af937f
+Subproject commit a02d053a6f732603f57ef1bfbe4b83279cf89874