roll: third_party/pigweed 6dc3d69..6667d2c (6 commits)

6667d2c:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/284275 pw_toolchain: Remove Rust WORKSPACE helper
0e9a0e5:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/236932 pw_bluetooth: Add GetHciHeaderSize and GetHciPayloadSize APIs
7ac6cb6:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/284692 pw_router: Migrate size report to Bazel
cbe119a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/282753 pw_kernel: Add Process object to scheduler
031db67:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/284553 pw_channel: Fix error with private destructor and pw::NoDestructor
37062d4:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/284612 docs/style/cpp: Fix typos; update async module link

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 6dc3d69e4bcebe..6667d2c2a67fac
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8717276234469741713
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I402bb6d637dd5d2aa19f8871b7d599fd3ef00a83
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/kudzu/+/284736
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
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 6dc3d69..6667d2c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6dc3d69e4bcebeec648e479ace8e0d4c66f2028e
+Subproject commit 6667d2c2a67fac82dbcb53e5a479b96fa30e7526