roll: third_party/pigweed 351d6c1..b2ed425 (6 commits)

b2ed425:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/272934 third_party/freertos: Change stack size type in support hooks
0cd6831:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/266273 pw_flatbuffers: Flatbuffers cmake support
7d1b8cd:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/273453 Revert "pw_malloc: Synchronize access to the system metrics"
a131637:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/273454 Revert "pw_malloc: Rename GetSystemAllocator to CreateSystemAllocator"
8af514d:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/273333 pw_bluetooth_sapphire: Fix uninitialized variable in bt::Random()
4a2ab50:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/273332 third_party/freertos: Silence new warning

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 351d6c113372ea..b2ed42565a79ce
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8721069352258445809
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1cc62437fef8139b44a76ec14c5225816db225be
Reviewed-on: https://pigweed-review.googlesource.com/c/gonk/+/273480
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 351d6c1..b2ed425 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 351d6c113372eac715c2068a8b24f77da7631640
+Subproject commit b2ed42565a79ce4be4eaaaaa4024f3dcd84e7b00