roll: third_party/pigweed pw_bluetooth_sapphire: Fix UBSAN failures in l2cap fuzz tests

Don't call memcpy with nullptrs.

Original-Bug: 393957973
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/278455
Tests-Not-Needed: Josh Conner <joshconner@google.com>
Presubmit-Verified: CQ Bot Account <pigweed-scoped@luci-project-accounts.iam.gserviceaccount.com>
Original-Revision: 8dab133797b53ee89b2aad7304325983242dae7f

Rolled-Repo: https://pigweed.googlesource.com/pigweed/pigweed
Rolled-Commits: 2861b6ad5f94c2..8dab133797b53e
Roll-Count: 1
Roller-URL: https://cr-buildbucket.appspot.com/build/8719409129069987969
GitWatcher: ignore
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I43b31f6f46f821a565ffcc8617e3cd69a380919e
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/experimental/+/278692
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 2861b6a..8dab133 160000
--- a/third_party/pigweed
+++ b/third_party/pigweed
@@ -1 +1 @@
-Subproject commit 2861b6ad5f94c2c8b4b393761d93c568eef9547e
+Subproject commit 8dab133797b53ee89b2aad7304325983242dae7f