roll: third_party/pigweed pw_bluetooth_proxy: Prevent flakes by zeroing arrays

Always initialize std::array in gtests.

Original-Bug: 369678786
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/237258
Original-Revision: bcda51c2834dcc7d6d2a4c862ddfae94ffb7b899

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 8c7b09401b950d..bcda51c2834dcc
Roller-URL: https://ci.chromium.org/b/8735782542249897873
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I1e94ffc8d8f75849813a54b93b87b3485f02e1d8
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/examples/+/238032
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 8c7b094..bcda51c 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 8c7b09401b950d46233ba4b6c0a2783fa429543e
+Subproject commit bcda51c2834dcc7d6d2a4c862ddfae94ffb7b899