roll: third_party/pigweed 879d211..840c2f2 (5 commits)

840c2f2:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/347233 pw_channel: Label module as deprecated
a33f5d8:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/342072 pw_ide: Introduce fixed compile command database generation
b3087c5:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/347232 pw_async2: Link to implementing futures guide from guides.rst
f0eb6ba:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/343754 pw_async2: Update the informed poll overview
5f2e38b:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/347132 pw_rpc_transport: Replace std::vector with pw::DynamicVector in tests

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 879d211c34ee5d..840c2f2a01431b
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8697634185673030849
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia7b57e22eea77cf5c815813f8c94e22298a35611
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/347174
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index 879d211..840c2f2 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 879d211c34ee5d93a07321a94d89ac48a4f1160f
+Subproject commit 840c2f2a01431b35dd2e295d79e7905b29f22e4d