roll: third_party/pigweed 6 commits

b4987e47aef3696 pw_stream_uart_mcuxpresso: Clean up dma stream com
1d8d68b37b99966 third_party/icu: Update Bazel rules for dependent
a10dc77e7bf9af0 pw_system: Add missing work queue thread
dbda0e98bd7b9b7 pw_system: Clean up pw_system/threads.cc
cd7e34bbe9e8dcb pw_function: Dynamic allocation for upstream host
61c6b9a2ed03145 pw_web: Implement console-level split panels

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 27aedcf1158eb97..b4987e47aef3696
Roller-URL: https://ci.chromium.org/b/8742677051548072337
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I01da9508fa0aa1ea0ee885c98d6faa2daf994588
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/222632
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 27aedcf..b4987e4 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 27aedcf1158eb9752b063661ad9c6cf29168625e
+Subproject commit b4987e47aef3696796b32a0cbdaf7fc4bb1266fa