[third_party/pigweed] Roll 3 commits

5b8b84f452c9ced pw_snapshot: Process snapshots based on CPU archit
cfd57d8453d3291 pw_thread_freertos: Use TCB for running stack poin
343cadc83c5ea36 pw_cli: Fix subprocess runner arg concatenation

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 287a6a668c70176..5b8b84f452c9ced
Roller-URL: https://ci.chromium.org/b/8750445513745878769
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If8a77db05265720b61baec8ee8425cefced5dd3d
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/204090
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 287a6a6..5b8b84f 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 287a6a668c70176325b908fc6927bf98cde0a8ac
+Subproject commit 5b8b84f452c9cedc82cc34aaaaf4eb60bf3c8aeb