roll: third_party/pigweed fd94748..4a28597 (7 commits)

4a28597:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/240811 docs: Add Bazel style guide
bb9f65d:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/251914 pw_assert: Improve error messages in constant expressions
d257329:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/251432 pw_protobuf_compiler: Split pw_proto_library.bzl
2bfeaec:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/249754 pw_bluetooth_proxy: Add L2cap service listener API
9de12f9:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/252557 pw_presubmit: Remove pw_grpc from includes exception list
a7c4dd8:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/251992 pw_containers: Do not move assign to destroyed objects in Vector::erase
983b4f1:https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/252555 pw_grpc: Remove old constructor and make multibuf allocator required

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: fd9474821e2339..4a28597bf8cc64
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8729316284568412017
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I741820226f4db58455e5594baed16361e036f2ad
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/kudzu/+/252291
Commit-Queue: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>
Bot-Commit: Pigweed Roller <pigweed-roller@pigweed-service-accounts.iam.gserviceaccount.com>
diff --git a/third_party/pigweed b/third_party/pigweed
index fd94748..4a28597 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit fd9474821e23393af26b770f5020dde9f5493ae5
+Subproject commit 4a28597bf8cc64f7cfc4cc019ba969bc10747c2b