roll: third_party/pigweed roll: gn

From git_revision:4a8016dc391553fa1644c0740cc04eaac844121e
To git_revision:7a8aa3a08a13521336853a28c46537ec04338a2d

Roll-Count: 1
GitWatcher: ignore
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/274332
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Original-Revision: 8b7efb07d47ebb3e7b8005ac939379b52fcb258d

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 3c0823b683f02f..8b7efb07d47ebb
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8720840230920366897
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic5fdddd3400c622f25f70eca85ee8355449dbed0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/274314
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 3c0823b..8b7efb0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 3c0823b683f02f93485a5da0f4bd110130fc40ca
+Subproject commit 8b7efb07d47ebb3e7b8005ac939379b52fcb258d