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/8720208254940912513
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If17f2ecc68eb4f829ea39c2e1e24f7ee41a47f0d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/276167
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: 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