[roll third_party/pigweed] pw_thread: Run buildifier

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/57300

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 260b0cb56ee01da..2031ac0f8d8ad65
Roller-URL: https://ci.chromium.org/b/8838725772098039440
Cq-Cl-Tag: roller-builder:pigweed-experimental-roller
Cq-Cl-Tag: roller-bid:8838725772098039440
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Icdb8493f27af95ec9ebafe68116830ac67da0a1b
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/57322
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 260b0cb..2031ac0 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 260b0cb56ee01da8d6676db489dc3b25780e9c70
+Subproject commit 2031ac0f8d8ad656ef3281de3a44b432b7a2a7bd