roll: third_party/pigweed 91cfc6e..bc9c98a (7 commits)

bc9c98a:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/311317 pw_bluetooth_sapphire: Update Fuchsia SDK
878a955:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/311472 doxygen: Alphabetically sort the modules index
be45472:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/309912 pw_clock_tree: Update Element classes to communicate traits
effa0d0:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/311435 doxygen: Add module alias
4214225:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/311393 doxygen: Fix global nav styles
e5dffd7:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/309152 pw_clock_tree: Remove unused DependentElement::UpdateSource()
0bca04c:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/311107 docs: Document how to use mypy from Bazel

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 91cfc6e5a7cb9e..bc9c98ac24c67f
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8707073070845876833
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ic6365250fc501b1b7a5fe81de098c96781098ef3
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/311200
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 91cfc6e..bc9c98a 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 91cfc6e5a7cb9e7e7130a9964d51a99dbf261823
+Subproject commit bc9c98ac24c67f27ab07480fb6bab539cd26549e