roll: third_party/pigweed 6d68ac5..b40ecc9 (2 commits)

b40ecc9:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/244672 pw_toolchain: Add ARM Cortex-M55F GCC toolchain
63ebec1:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/243999 pw_async2: Update docs

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 6d68ac5934e136..b40ecc98b47a37
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8732832655329775441
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I95137447ce31340cad16ac3119cb6f61e1ff1c9c
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/245012
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 6d68ac5..b40ecc9 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 6d68ac5934e136e0911b28ecd5e4283dd5a39eee
+Subproject commit b40ecc98b47a37b187f40408ae0c3d89ef9b5f79