[roll third_party/pigweed] roll: go

From: version:2@1.21.1.chromium1
To: version:2@1.21.2
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/175083
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 04e61c8160c5a6b..666f31b024a52c8
Roller-URL: https://ci.chromium.org/b/8767713430795880321
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6170177c8fb92cd58eb1af1b48b3d0ce92d2b387
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/174777
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.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 04e61c8..666f31b 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 04e61c8160c5a6b8913a5d3f709e07a24680b1f8
+Subproject commit 666f31b024a52c83b516f7ed8b719ead1c7e8fb0