roll: third_party/pigweed c91fc7c..9adb198 (2 commits)

9adb198:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/301455 pw_kernel: Add cloneable signaler interface to Events
8f705b4:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/300534 pw_stream_uart_linux: Fix bazel layering check

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: c91fc7c107f021..9adb198099f30a
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8709683721102308961
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I4df5c839f76cfc2293984dcf29e8dbd766f503ff
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/304279
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 c91fc7c..9adb198 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit c91fc7c107f021fb967af806fcedc5abc335c2b0
+Subproject commit 9adb198099f30a18e219fb8b16990c375a4b7c84