[roll third_party/pigweed] roll: gn

From: git_revision:22581fb46c0c0c9530caa67149ee4dd8811063cf
To: git_revision:06cdcc8e1fa8e56f70efb4357d473345b7d1c083
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/199351
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: dabe438c436d688..c6c4a5bbeef2f11
Roller-URL: https://ci.chromium.org/b/8752541729044238353
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I88e2a9ba4003d3146490671d8ba674c7029781ba
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/199410
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 dabe438..c6c4a5b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit dabe438c436d6889d43111eb29b8a0410f2d8f17
+Subproject commit c6c4a5bbeef2f11b88a754a4cbc0270f18df79d7