roll: third_party/pigweed roll: gn

From git_revision:18602f6cf1168cf78302024043edc02e8bad2ffb
To git_revision:6e8e0d6d4a151ab2ed9b4a35366e630c55888444

Roll-Count: 1
GitWatcher: ignore
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/280253
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Original-Revision: 6985a85e5cc6b026f77c83b0204cd6bd433a586f

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 964608167ffcd6..6985a85e5cc6b0
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8718897997475691345
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4440736f9eb46111c888ee94cf222498b4a0067d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/kudzu/+/280121
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.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 9646081..6985a85 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 964608167ffcd644275d127e9b928639190970e3
+Subproject commit 6985a85e5cc6b026f77c83b0204cd6bd433a586f