roll: third_party/pigweed roll: gn

From git_revision:90478db6b59b9bebf7ca4cf912d860cf868e724c
To git_revision:487f8353f15456474437df32bb186187b0940b45

Roll-Count: 1
GitWatcher: ignore
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/288653
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Original-Revision: 947b9681400b8ba5f0af01995354eeb06b393747

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: d0b2600d62f695..947b9681400b8b
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8715768191749834353
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ica42f70b6e8fa4539d0b0d2554afcd6e161633c8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/288712
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index d0b2600..947b968 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit d0b2600d62f695d5f8b2a83c9bc67d630ade85c9
+Subproject commit 947b9681400b8ba5f0af01995354eeb06b393747