roll: third_party/pigweed 8441834..79c3430 (4 commits)

79c3430:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/246552 pw_build: Support specify rust macro toolchain
98aec6f:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/247353 pw_channel: Add guidance about when to implement Channel
b15aa11:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/246892 pw_channel: Add a note about reading and writing from different tasks
4e78f90:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/246972 docs: Fix in-site search

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 8441834149a56c..79c3430719bc8e
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8732054369001870305
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I71ca6730e80fab98b37867427105a68e6d82bb3c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/247020
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.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 8441834..79c3430 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8441834149a56c65113301b35c173d4fe8c43c5b
+Subproject commit 79c3430719bc8e3320eb2612303e7040baae2001