[third_party/pigweed] Roll 3 commits

188bd4726e0eca3 *: Remove remaining usages of legacy thread entry
74004ce5958687a pw_async: Add missing dispatcher facades to cmake
ae56930feef9426 fuchsia: Add defer.h to Bazel build defs

https://pigweed.googlesource.com/pigweed/pigweed
third_party/pigweed Rolled-Commits: 9e90af3746446e4..188bd4726e0eca3
Roller-URL: https://ci.chromium.org/b/8749546372717087377
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: If2a632acd36921f01aff3fa92511032e2ea16eed
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/quickstart/bazel/+/206878
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Commit-Queue: 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 9e90af3..188bd47 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 9e90af3746446e4aaaa0ccc5dd2079cf60d744a1
+Subproject commit 188bd4726e0eca3c7cad7fa8f7c8b76c1e12cc38